SANDSTROM, Justice.
[¶ 1] G.R.H. appeals a district court order denying his petition for discharge from commitment as a sexually dangerous individual. We affirm.
I
[¶ 2] G.R.H. was civilly committed as a sexually dangerous individual in 2004, and we affirmed the district court’s commitment order. Matter of G.R.H., 2006 ND 56, ¶ 3, 711 N.W.2d 587. He requested a discharge hearing in 2005 while this Court was reviewing his initial commitment, but no action was taken on that request pending our decision in the initial matter. In 2006, his next request for discharge was heard and denied by the district court, which found he remained a sexually dangerous individual. G.R.H. requested a third discharge hearing in 2007, and the district court again found by clear and convincing evidence that G.R.H. remained a sexually dangerous individual and denied his petition. We affirmed the district court’s decision. Matter of G.R.H., 2008 ND 222, 758 N.W.2d 719.
[¶ 3] G.R.H. applied for his most recent discharge hearing in April 2009. The evidence at the hearing centered on the testimony and reports of two expert witnesses. The first expert, Lynne Sullivan, Ph.D., testified on behalf of the State. She concluded G.R.H. should remain committed because he meets all three requirements in the classification of a sexually dangerous individual under N.D.C.C. § 25-03.3-01(8). Dr. Sullivan testified she believed G.R.H. met the first requirement, that he previously engaged in sexually predatory conduct, on the basis of his past convictions and other admissions regarding sexual activity with teenage girls. Dr. Sullivan also believed G.R.H. met the second requirement, that he has an acquired or congenital condition manifested by a sexual disorder, because of recurrent, intense sexual thoughts, his arousal by girls going through puberty, and his anti-social personality disorder. Finally, she testified G.R.H. met the third requirement, that he is likely to engage in further sexually predatory conduct, in part because of the findings already mentioned and because of the results of certain risk assessment tools showing G.R.H. is prone to recidivism.
[¶ 4] Dr. Sullivan also relied in part on some of G.R.H.’s admissions in treatment. In order to progress to the next level of treatment, G.R.H. was required to take a polygraph examination, which he failed. Following this examination, G.R.H. made admissions that were previously unknown to his caretakers. G.R.H. admitted that, against treatment rules, he had engaged in sex with his girlfriend during visitation and used a credit card for phone sex. G.R.H. also admitted to sexual activity with twelve teenage girls. He was demoted to a lower treatment level on the basis [463]*463of these admissions, which Dr. Sullivan later used in her assessment.
[¶ 5] Robert Riedel, Ph.D., served as G.R.H.’s independent expert evaluator and agreed with Dr. Sullivan’s conclusions on the first two requirements in the classification of a sexually dangerous individual under N.D.C.C. § 25-03.3-01(8). He testified the first requirement was met because G.R.H. has a proven history of sexually predatory conduct. Dr. Riedel also agreed on the second requirement, though he noted G.R.H.’s primary arousal is to adult females, and in the past he “reverted to teenagers because of availability of teenagers and the lack of availability of adult females.”
[¶ 6] Dr. Riedel disagreed with Dr. Sullivan’s conclusions on the third requirement, partly because of the risk assessment tests, some of which he declared were “way out of date” and not good predictors of future sexual misconduct. He also noted G.R.H.’s “steady progress” in treatment, his family support system, and his plans for release all lowered his chance of recidivism. On the basis of these findings, Dr. Riedel concluded G.R.H. does not meet the statutory requirements for continued commitment.
[¶7] G.R.H. argued his rights against self-incrimination were violated by using his admissions made in treatment against him, because the proceedings were imper-missibly punitive in nature. The district court disagreed and denied his petition for discharge. The court found G.R.H. did not prove by clear and convincing evidence the proceedings were so punitive as to be rendered criminal. It noted treatment normally involves advancements and setbacks, and honesty in treatment is required for an individual to advance to completion. Recognizing that the experts agreed G.R.H. met the first two requirements for classification as a sexually dangerous individual, the court concluded the evidence showed G.R.H. met the third requirement as well. It concluded G.R.H. is likely to engage in further sexually predatory conduct and has a “significant” problem controlling his behavior.
[¶ 8] On appeal, G.R.H. argues the district court should not have considered his admissions in treatment, because they violated his rights against self-incrimination and are being used to punish him. He also argues there was not clear and convincing evidence he would engage in further acts of sexually predatory conduct. Finally, he contends the district court failed to find he has serious difficulty controlling his behavior, and therefore it could not conclude he is a sexually dangerous individual under N.D.C.C. § 25-03.3-01(8).
[¶ 9] The district court had jurisdiction of the discharge hearing under N.D. Const, art. VI, § 8, and N.D.C.C. § 25-03.3-02. G.R.H.’s appeal was timely under N.D.C.C. § 25-03.3-19. This Court has jurisdiction under N.D. Const. art. VI, §§ 2 and 6, and N.D.C.C. § 25-03.3-19.
II
[¶ 10] We apply a modified clearly erroneous standard in reviewing commitments of sexually dangerous individuals. Interest of Maedche, 2010 ND 171, ¶ 9, 788 N.W.2d 331. “We will affirm a district court’s commitment order unless the order is induced by an erroneous view of the law, or we are firmly convinced the order is not supported by clear and convincing evidence.” Id.
[¶ 11] For the purposes of involuntary civil commitment, N.D.C.C. § 25-03.3-01(8) defines a sexually dangerous individual as:
[A]n individual who is shown to have engaged in sexually predatory conduct and who has a congenital or acquired [464]*464condition that is manifested by a sexual disorder, a personality disorder, or other mental disorder or dysfunction that makes that individual likely to engage in further acts of sexually predatory conduct which constitute a danger to the physical or mental health or safety of others....
The United States Supreme Court has held that civil commitment of a sexually dangerous individual cannot be sustained without finding that the individual has serious difficulty controlling his or her behavior. Kansas v. Crane, 534 U.S. 407, 413, 122 S.Ct. 867, 151 L.Ed.2d 856 (2002). The United States Supreme Court stated this “distinction is necessary lest civil commitment become a mechanism for retribution or general deterrence — functions properly those of criminal law, not civil commitment.” Id. at 412, 122 S.Ct. 867 (quotations omitted). We have construed the definition of a sexually dangerous individual to require a nexus between the disorder and dangerousness, which distinguishes such an individual from other dangerous persons. Matter of Hanenberg, 2010 ND 8, ¶ 8, 777 N.W.2d 62.
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SANDSTROM, Justice.
[¶ 1] G.R.H. appeals a district court order denying his petition for discharge from commitment as a sexually dangerous individual. We affirm.
I
[¶ 2] G.R.H. was civilly committed as a sexually dangerous individual in 2004, and we affirmed the district court’s commitment order. Matter of G.R.H., 2006 ND 56, ¶ 3, 711 N.W.2d 587. He requested a discharge hearing in 2005 while this Court was reviewing his initial commitment, but no action was taken on that request pending our decision in the initial matter. In 2006, his next request for discharge was heard and denied by the district court, which found he remained a sexually dangerous individual. G.R.H. requested a third discharge hearing in 2007, and the district court again found by clear and convincing evidence that G.R.H. remained a sexually dangerous individual and denied his petition. We affirmed the district court’s decision. Matter of G.R.H., 2008 ND 222, 758 N.W.2d 719.
[¶ 3] G.R.H. applied for his most recent discharge hearing in April 2009. The evidence at the hearing centered on the testimony and reports of two expert witnesses. The first expert, Lynne Sullivan, Ph.D., testified on behalf of the State. She concluded G.R.H. should remain committed because he meets all three requirements in the classification of a sexually dangerous individual under N.D.C.C. § 25-03.3-01(8). Dr. Sullivan testified she believed G.R.H. met the first requirement, that he previously engaged in sexually predatory conduct, on the basis of his past convictions and other admissions regarding sexual activity with teenage girls. Dr. Sullivan also believed G.R.H. met the second requirement, that he has an acquired or congenital condition manifested by a sexual disorder, because of recurrent, intense sexual thoughts, his arousal by girls going through puberty, and his anti-social personality disorder. Finally, she testified G.R.H. met the third requirement, that he is likely to engage in further sexually predatory conduct, in part because of the findings already mentioned and because of the results of certain risk assessment tools showing G.R.H. is prone to recidivism.
[¶ 4] Dr. Sullivan also relied in part on some of G.R.H.’s admissions in treatment. In order to progress to the next level of treatment, G.R.H. was required to take a polygraph examination, which he failed. Following this examination, G.R.H. made admissions that were previously unknown to his caretakers. G.R.H. admitted that, against treatment rules, he had engaged in sex with his girlfriend during visitation and used a credit card for phone sex. G.R.H. also admitted to sexual activity with twelve teenage girls. He was demoted to a lower treatment level on the basis [463]*463of these admissions, which Dr. Sullivan later used in her assessment.
[¶ 5] Robert Riedel, Ph.D., served as G.R.H.’s independent expert evaluator and agreed with Dr. Sullivan’s conclusions on the first two requirements in the classification of a sexually dangerous individual under N.D.C.C. § 25-03.3-01(8). He testified the first requirement was met because G.R.H. has a proven history of sexually predatory conduct. Dr. Riedel also agreed on the second requirement, though he noted G.R.H.’s primary arousal is to adult females, and in the past he “reverted to teenagers because of availability of teenagers and the lack of availability of adult females.”
[¶ 6] Dr. Riedel disagreed with Dr. Sullivan’s conclusions on the third requirement, partly because of the risk assessment tests, some of which he declared were “way out of date” and not good predictors of future sexual misconduct. He also noted G.R.H.’s “steady progress” in treatment, his family support system, and his plans for release all lowered his chance of recidivism. On the basis of these findings, Dr. Riedel concluded G.R.H. does not meet the statutory requirements for continued commitment.
[¶7] G.R.H. argued his rights against self-incrimination were violated by using his admissions made in treatment against him, because the proceedings were imper-missibly punitive in nature. The district court disagreed and denied his petition for discharge. The court found G.R.H. did not prove by clear and convincing evidence the proceedings were so punitive as to be rendered criminal. It noted treatment normally involves advancements and setbacks, and honesty in treatment is required for an individual to advance to completion. Recognizing that the experts agreed G.R.H. met the first two requirements for classification as a sexually dangerous individual, the court concluded the evidence showed G.R.H. met the third requirement as well. It concluded G.R.H. is likely to engage in further sexually predatory conduct and has a “significant” problem controlling his behavior.
[¶ 8] On appeal, G.R.H. argues the district court should not have considered his admissions in treatment, because they violated his rights against self-incrimination and are being used to punish him. He also argues there was not clear and convincing evidence he would engage in further acts of sexually predatory conduct. Finally, he contends the district court failed to find he has serious difficulty controlling his behavior, and therefore it could not conclude he is a sexually dangerous individual under N.D.C.C. § 25-03.3-01(8).
[¶ 9] The district court had jurisdiction of the discharge hearing under N.D. Const, art. VI, § 8, and N.D.C.C. § 25-03.3-02. G.R.H.’s appeal was timely under N.D.C.C. § 25-03.3-19. This Court has jurisdiction under N.D. Const. art. VI, §§ 2 and 6, and N.D.C.C. § 25-03.3-19.
II
[¶ 10] We apply a modified clearly erroneous standard in reviewing commitments of sexually dangerous individuals. Interest of Maedche, 2010 ND 171, ¶ 9, 788 N.W.2d 331. “We will affirm a district court’s commitment order unless the order is induced by an erroneous view of the law, or we are firmly convinced the order is not supported by clear and convincing evidence.” Id.
[¶ 11] For the purposes of involuntary civil commitment, N.D.C.C. § 25-03.3-01(8) defines a sexually dangerous individual as:
[A]n individual who is shown to have engaged in sexually predatory conduct and who has a congenital or acquired [464]*464condition that is manifested by a sexual disorder, a personality disorder, or other mental disorder or dysfunction that makes that individual likely to engage in further acts of sexually predatory conduct which constitute a danger to the physical or mental health or safety of others....
The United States Supreme Court has held that civil commitment of a sexually dangerous individual cannot be sustained without finding that the individual has serious difficulty controlling his or her behavior. Kansas v. Crane, 534 U.S. 407, 413, 122 S.Ct. 867, 151 L.Ed.2d 856 (2002). The United States Supreme Court stated this “distinction is necessary lest civil commitment become a mechanism for retribution or general deterrence — functions properly those of criminal law, not civil commitment.” Id. at 412, 122 S.Ct. 867 (quotations omitted). We have construed the definition of a sexually dangerous individual to require a nexus between the disorder and dangerousness, which distinguishes such an individual from other dangerous persons. Matter of Hanenberg, 2010 ND 8, ¶ 8, 777 N.W.2d 62. The district court is the best evaluator of conflicting testimony, and it is not the function of this Court to second-guess its conclusions as to which is more credible. Matter of M.D., 2008 ND 208, ¶ 7, 757 N.W.2d 559.
A
[¶ 12] G.R.H. first argues his admissions during treatment should not have been considered by the district court in denying his petition. These admissions were used by the court in concluding G.R.H. met the third requirement, that he is likely to engage in further acts of sexually predatory conduct that constitute a danger to others. G.R.H. contends N.D.C.C. ch. 25-03.3 is impermissibly punitive in nature because it subjects him to indefinite confinement motivated by retribution and deterrence. He also notes he may be charged criminally under N.D.C.C. ch. 12.1-20 for behavior that may trigger commitment under N.D.C.C. ch. 25-03.3. He argues that allowing a court to consider his statements made in treatment creates an unavoidable dilemma: If he answers questions truthfully, his responses may form the basis for further confinement. If he is uncooperative in answering, his failure to answer can also form the basis for further confinement.
[¶ 13] G.R.H.’s argument asks us to consider the purpose and effect of N.D.C.C. ch. 25-03.3. Statutory interpretation is a question of law, fully reviewable on appeal. VND, LLC v. Leevers Foods, Inc., 2003 ND 198, ¶ 9, 672 N.W.2d 445. Words used in a statute are given their ordinary and commonly understood meaning unless a contrary intention plainly appears. N.D.C.C. § 1-02-02. Statutes are construed as a whole and are harmonized with related provisions. N.D.C.C. § 1-02-07. When the language of a statute is unambiguous, “the letter of [the statute] is not to be disregarded under the pretext of pursuing its spirit.” N.D.C.C. § 1-02-05. We also consider the context of the statutes and the purposes for their enactment. Falcon v. State, 1997 ND 200, ¶ 9, 570 N.W.2d 719.
[¶ 14] Chapter 25-03.3, N.D.C.C., is expressly intended to be civil in nature. See, e.g., N.D.C.C. § 25-03.3-03.1 (“[A] recommendation is to be made to a state’s attorney for civil commitment of the inmate under this chapter.”). We inquire further, however, to assure that a statutory scheme intended to be civil in nature is not so punitive in purpose or effect as to be transformed into a criminal penalty. State v. Kelly, 2001 ND 135, ¶ 16, 631 N.W.2d 167. In Kelly we noted that the [465]*465factors in Kennedy v. Mendoza-Martinez, 372 U.S. 144, 83 S.Ct. 554, 9 L.Ed.2d 644 (1963), provide useful indicators in evaluating whether a civil penalty is effectively punitive in application:
(1) the sanction involves an affirmative disability or restraint; (2) it has historically been regarded as a punishment; (3) it comes into play only on a finding of scienter; (4) its operation will promote the traditional aims of punishment — retribution and deterrence; (5) the behavior to which it applies is already a crime; (6) an alternative purpose to which it may rationally be connected is assignable for it; and (7) it appears excessive in relation to the alternative purpose assigned.
Kelly, at ¶ 16. By “the clearest proof’ the challenger must show the commitment statute is so punitive in form and effect as to render it criminal despite the legislation’s intent to the contrary. In re M.D., 1999 ND 160, ¶ 26, 598 N.W.2d 799 (see also United States v. Ursery, 518 U.S. 267, 290, 116 S.Ct. 2135, 135 L.Ed.2d 549 (1996)).
[¶ 15] We are guided by the United States Supreme Court’s decision in Kansas v. Hendricks, 521 U.S. 346, 117 S.Ct. 2072, 138 L.Ed.2d 501 (1997), in deciding whether N.D.C.C. ch. 25-03.3 is impermissibly punitive. The United States Supreme Court stated in Hendricks that involuntary commitment statutes will be upheld if they are subject to proper procedures and evi-dentiary standards. Id. at 357, 117 S.Ct. 2072. “It thus cannot be said that the involuntary civil confinement of a limited subclass of dangerous persons is contrary to our understanding of ordered liberty.” Id. If the State seeks to commit an individual under N.D.C.C. ch. 25-03.3, it must do so within a rigid evidentiary and procedural framework. The State must initially show probable cause for a commitment hearing to take place. N.D.C.C. § 25-03.3-11. At the commitment hearing, nothing less than “clear and convincing evidence” may justify the commitment as a sexually dangerous individual. N.D.C.C. § 25-03.3-13. The court must provide the individual with an independent expert evaluator to participate on the respondent’s behalf. N.D.C.C. § 25-03.3-12. A committed individual has a right to petition for discharge annually, which requires the State to again prove by clear and convincing evidence that the individual remains sexually dangerous. N.D.C.C. § 25-03.3-18. These statutes reflect a proper emphasis on rigid procedures and evidentiary standards as required by Hendricks to guard against impermissible civil commitments.
[¶ 16] North Dakota’s statutory scheme closely resembles the statute upheld in Hendricks. In Hendricks, the United States Supreme Court upheld the Kansas statute, stating it was “plainly of a kind with ... other civil commitment statutes: It requires a finding of future dangerousness, and then links that finding to the existence of a ‘mental abnormality’ or ‘personality disorder’ that makes it difficult, if not impossible, for the person to control his dangerous behavior.” Hendricks, 521 U.S. at 358, 117 S.Ct. 2072. North Dakota’s commitment framework contains this exact requirement endorsed by the United States Supreme Court. Section 25-03.3-01(8), N.D.C.C., requires the individual’s condition be manifested by a “sexual disorder, a personality disorder, or other mental disorder or dysfunction.” By requiring this connection between the dangerous condition and a mental disorder, N.D.C.C. ch. 25-03.3 narrows the class of affected individuals to those with impairments rendering them dangerous beyond their control.
[¶ 17] Chapter 25-03.3, N.D.C.C., conforms to all the requirements of Hen[466]*466dricks. It contains procedural and eviden-tiary safeguards for affected individuals. Also required is a specific finding of a mental disorder, limiting its effect to a narrow class of individuals. The fifth Kennedy factor weighs against N.D.C.C. ch. 25-08.3 in that some behavior may trigger both criminal liability and civil commitment. This overlap is narrow, however, and civil commitment in these circumstances is justified by a significant public safety interest. “[T]he mere fact that a person is detained does not inexorably lead to the conclusion that the government has imposed punishment.” U.S. v. Salerno, 481 U.S. 739, 746, 107 S.Ct. 2095, 95 L.Ed.2d 697 (1987). The civil commitment provisions of N.D.C.C. ch. 25-03.3 are not impermissibly punitive in form or effect.
[¶ 18] Because N.D.C.C. ch. 25-03.3 operates properly as a civil commitment framework, G.R.H.’s argument that his right against self-incrimination was violated is without merit. See U.S. Const. amend. V. Chapter 25-03.3, N.D.C.C., serves a dual purpose, protecting the public from the most dangerous sexual offenders while simultaneously treating those individuals so they may safely return to the community. Interest of P.F., 2008 ND 37, ¶ 20, 744 N.W.2d 724 (citing Hearing on H.B. 1047 Before the Senate Judiciary Comm., 55th N.D. Legis. Sess. (March 5, 1997) (testimony of Attorney General Heidi Heitkamp)). The district court’s consideration of G.R.H.’s admissions served these dual aims. The court must consider all information regarding G.R.H.’s condition if the public is to be protected and G.R.H. is to receive the most effective treatment. G.R.H.’s treatment can be successful only if he is open and honest, and the public is not adequately protected if G.R.H. is released from treatment prior to his successful completion.
B
[¶ 19] G.R.H. argues the district court erred in concluding there was clear and convincing evidence that he is likely to engage in further acts of sexually predatory conduct, the third requirement in the sexually dangerous individual test under N.D.C.C. § 25-03.3-01(8). G.R.H. contends the court’s finding was clearly erroneous because it considered his admissions in treatment and also the results of certain psychological assessments used by Dr. Riedel and Dr. Sullivan.
[¶ 20] Unlike the previous issue, this argument does not focus on the general effect of N.D.C.C. ch. 25-03.3. Instead, it focuses on the decision to commit G.R.H. under the existing statutes. G.R.H.’s civil commitment under N.D.C.C. ch. 25-03.3 is reviewed under a modified clearly erroneous standard of review. See Maedche, 2010 ND 171, ¶ 9, 788 N.W.2d 331.
[¶ 21] “[T]he phrase ‘likely to engage in further acts of sexually predatory conduct’ means the individual’s propensity towards sexual violence is of such a degree as to pose a threat to others.” In re R.A.S., 2009 ND 101, ¶ 6, 766 N.W.2d 712 (quotation omitted). The State was required to prove by clear and convincing evidence that G.R.H. had this propensity. N.D.C.C. § 25-03.3-13. In concluding the State met its burden, the district court noted it was relying on the psychological assessments and the testimony of Dr. Rie-del and Dr. Sullivan.
[¶ 22] The district court’s order reflects an appropriate consideration of the psychological assessments. Dr. Riedel testified he believed one of the tests employed, the Minnesota Sex Offender Screening Score Revised (“Mn-SOSTR”), was out-of-date and not being used in a way that was scientifically proper. Dr. Sullivan testified that while parts of the MnSOST-R may be out-of-date, other uses [467]*467of the test “are still considered to be relevant and appropriate.” The district court nevertheless found the Mn-SOSTR overestimated the risk of recidivism and concluded it should not be considered.
[¶ 23] The court considered the results of the Static-99-R test, however, which both Dr. Riedel and Dr. Sullivan used to classify G.R.H. as a “high risk” individual. Both doctors testified about their use and continued reliance on this instrument. The court considered the results of the Static-99-R, which both doctors testified was reliable, and disregarded the results of the Mn-SOSTR test that had questionable predictive value. This consideration of the psychological assessments shows proper care and caution, and was not clearly erroneous.
[If 24] The court’s consideration of the doctors’ testimony was also reasonable. It was proper for the doctors to consider G.R.H.’s admissions in treatment, and they also had a wealth of other information on which to form their opinions. Dr. Sullivan and Dr. Riedel both personally interviewed G.R.H. They had access to his performance records in treatment. They had the ability to consider his sexual history. They had the ability to review his past scores on the various assessment tests. Dr. Riedel and Dr. Sullivan had access to a significant amount and variety of information on which they could evaluate G.R.H., and their opinions could reasonably be relied upon.
[¶ 25] The court’s consideration of the experts’ testimony in conjunction with all of the other evidence presented is the type of inquiry required by N.D.C.C. §§ 25-03.3-13 and 25-03.3-18(4). The district court’s finding that G.R.H. is likely to engage in further acts of sexually predatory conduct was not clearly erroneous.
C
[¶ 26] G.R.H. argues the district court could not have found he remains a sexually dangerous individual, because it did not find he had serious difficulty controlling his behavior.
[¶ 27] The district court is required to find that an individual to be committed has a serious problem controlling his behavior. Matter of Hehn, 2008 ND 36, ¶ 19, 745 N.W.2d 631. G.R.H.’s argument stems from the district court’s order stating, “The Court also finds that the evidence shows G.R.H. has a significant problem controlling his behavior.... ” (Emphasis added.) Despite the court’s use of the word “significant” in its ultimate conclusion, its analysis makes it clear the court employed the correct test. Earlier in its order the court quoted the Crane standard in noting the State had to prove G.R.H. had “serious difficulty controlling his behavior” to establish the third requirement of the sexually dangerous individual test. See Crane, 534 U.S. at 413, 122 S.Ct. 867. The court then analyzed in detail the third requirement before ultimately concluding G.R.H. remained a sexually dangerous individual. The district court properly found G.R.H. had serious difficulty controlling his behavior.
Ill
[¶ 28] North Dakota’s civil commitment framework for sexually dangerous individuals, N.D.C.C. ch. 25-03.3, is not imper-missibly punitive in nature. G.R.H.’s right against self-incrimination was not violated, and the district court’s findings were not clearly erroneous. We affirm the district court order denying G.R.H.’s petition for discharge.
[¶ 29] GERALD W. VANDE WALLE, C.J., DANIEL J. CROTHERS, and MARY MUEHLEN MARING, JJ., concur.