BOWMAN, Circuit Judge.
Mutual of Omaha Insurance Company (Mutual) brought suit against Franklyn No-vak (Novak) alleging trademark infringement and trademark disparagement. The District Court found for Mutual on the infringement issue1 and granted a permanent injunction, but rejected the disparagement claim. Novak appeals the decision concerning infringement and Mutual appeals the disparagement decision. We affirm the District Court’s infringement decision and do not reach the disparagement issue.2
Beginning in 1952, Mutual acquired trademark registrations for marks used in connection with its insurance services and a television program it sponsors. These marks include the familiar “Indian head” logo and the designations “Mutual of Omaha” and “Mutual of Omaha’s Wild Kingdom.”
In 1983 Novak produced a design reminiscent of the Mutual marks. It uses the words “Mutant of Omaha” and depicts a side view of a feather-bonneted, emaciated human head. Novak initially put the design on T-shirts along with the words “Nuclear Holocaust Insurance.” Novak marketed approximately 4000 of these shirts before Mutual obtained a preliminary injunction. He also had the design placed on sweatshirts, caps, buttons, and coffee mugs, which he has offered for sale at retail shops, exhibitions, and fairs. Novak also has advertised such merchandise on television and in newspapers and magazines.
After a trial on the merits of Mutual’s claims, the District Court ruled that Novak had infringed Mutual’s trademarks. The District Court found that Novak’s use of the design created a likelihood of confusion as to Mutual’s sponsorship of or affiliation with Novak’s merchandise, and therefore held such use to be in violation of both federal and state law. Accordingly, the District Court permanently enjoined Novak from advertising or marketing T-shirts, coffee mugs, and other products featuring the designations “Mutant of Omaha,” “Mutant Kingdom,” and “Mutant of Omaha’s Mutant Kingdom,” or confusingly similar designations, and also permanently enjoined Novak from using as a logo a design confusingly similar to Mutual’s “Indian head” logo.
Like most trademark cases, this case revolves around the “likelihood of confusion” issue. See, e.g., WSM, Inc. v. Hilton, 724 F.2d 1320 (8th Cir.1984); Vitek Sys., Inc. v. Abbott Laboratories, 675 F.2d 190 (8th Cir.1982); SquirtCo v. Seven-Up Co., 628 F.2d 1086 (8th Cir.1980). Specifically, the ultimate issue here is whether Novak’s design so resembles Mutual’s marks that it is likely to cause confusion among consumers as to whether Mutual has sponsored, endorsed, or is otherwise affiliated with the design. See Jordache Enters. v. Hogg Wyld, Ltd., 828 F.2d 1482, 1484 (10th Cir.1987); Kentucky Fried Chicken Corp. v. Diversified Packaging Corp., 549 F.2d 368, 388 (5th Cir.1977). Likelihood of confusion is a question of fact. WSM, Inc., 724 F.2d at 1329; Vitek Sys., 675 F.2d at 192; SquirtCo, 628 F.2d at 1091; Armstrong Cork Co. v. World Carpets, Inc., 597 F.2d 496, 501 (5th Cir.), cert. denied, 444 U.S. 932,100 S.Ct. 277, 62 L.Ed.2d 190 (1979). Thus, we can set aside the District Court’s finding of a likelihood of confusion only if it is clearly erroneous. Anderson v. City of Bessemer City, 470 U.S. 564, 573, 105 S.Ct. 1504, 1511, 84 L.Ed. 2d 518 (1985); Rogers v. Masem, 788 F.2d [399]*3992. We do not find it necessary to reach Mutual’s disparagement claim. Deciding this issue would not affect the remedy already obtained under the infringement claim. "It is a uniform course of appellate review procedure to decline to review questions not necessary to a decision by an appellate court.” Hutchinson Utils. Comm’n v. Curtiss-Wright Corp., 775 F.2d 231, 238 (8th Cir.1985) (quoting Highland Supply Corp. v. Reynolds Metals Co., 327 F.2d 725, 729 (8th Cir.1964)).
In resolving the likelihood of confusion issue, the District Court considered the factors that this Court enumerated in SquirtCo, 628 F.2d at 1091: 1) the strength of the trademark; 2) the similarity between the trademark and the defendant’s mark; 3) the competitive proximity of the products on which the respective marks are placed; 4) the intent of the alleged infringer to pass off his goods as those of the trademark holder; 5) the incidents of actual confusion; and 6) the degree of care likely to be exercised by potential customers of the trademark holder.3 We have continued to give weight to the SquirtCo factors in subsequent cases. See, e.g., WSM, Inc., 724 F.2d at 1329; Vitek Sys., 675 F.2d at 192-93.
The first factor is undisputed. The parties agree that Mutual’s trademarks are strong.
With respect to the second factor, the District Court concluded that Novak’s design is “very similar” to Mutual’s marks. Mutual of Omaha Ins. Co. v. Novak, 648 F.Supp. 905, 909 (D.Neb.1986). We do not disagree. The letters and styles of the phrases are virtually identical. Novak’s “Indian head” logo depicts a side view of a feather-bonneted head similar to Mutual’s “Indian head” logo. And use of the word “Mutant” in place of “Mutual” is, in the context of Novak’s design, suggestive of Mutual.4
Regarding competitive proximity, Novak puts his design on T-shirts and coffee mugs, the same types of items on which Mutual puts its marks. Mutual sells such items to agents and company representatives, who in turn use them as gifts or incentives. While the District Court determined that there was little or no direct competition in these items between the parties, it noted that infringement still could be found. Mutual of Omaha Ins. Co., 648 F.Supp. at 910. This is undoubtedly so, for confusion, not competition, is the touchstone of trademark infringement. See SquirtCo, 628 F.2d at 1091; Hanson v. Triangle Publications, Inc., 163 F.2d 74, 78 (8th Cir.1947), cert. denied, 332 U.S. 855, 68 S.Ct. 387, 92 L.Ed. 424 (1948). It is error to assume that trademark law protects against use of a mark only on directly competitive products. See Kentucky Fried Chicken, 549 F.2d at 388 (Fifth Circuit has “repeatedly rejected” the argument that “infringement occurs only when the alleged infringer uses the mark on the same category of product with respect to which the trademark owner obtained the mark”). “The law of trademarks ... is not so ossified, nor its protective scope so niggardly.” PGA v. Bankers Life & Casualty Co., 514 F.2d 665, 669 (5th Cir.1975). Moreover, by putting his design on items similar to those on which Mutual puts its marks, Novak increased the likelihood of confusion.
[400]*400With regard to the fourth factor, there is no finding by the District Court that Novak intended to pass off his goods as Mutual’s, and it seems clear that he did not.
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BOWMAN, Circuit Judge.
Mutual of Omaha Insurance Company (Mutual) brought suit against Franklyn No-vak (Novak) alleging trademark infringement and trademark disparagement. The District Court found for Mutual on the infringement issue1 and granted a permanent injunction, but rejected the disparagement claim. Novak appeals the decision concerning infringement and Mutual appeals the disparagement decision. We affirm the District Court’s infringement decision and do not reach the disparagement issue.2
Beginning in 1952, Mutual acquired trademark registrations for marks used in connection with its insurance services and a television program it sponsors. These marks include the familiar “Indian head” logo and the designations “Mutual of Omaha” and “Mutual of Omaha’s Wild Kingdom.”
In 1983 Novak produced a design reminiscent of the Mutual marks. It uses the words “Mutant of Omaha” and depicts a side view of a feather-bonneted, emaciated human head. Novak initially put the design on T-shirts along with the words “Nuclear Holocaust Insurance.” Novak marketed approximately 4000 of these shirts before Mutual obtained a preliminary injunction. He also had the design placed on sweatshirts, caps, buttons, and coffee mugs, which he has offered for sale at retail shops, exhibitions, and fairs. Novak also has advertised such merchandise on television and in newspapers and magazines.
After a trial on the merits of Mutual’s claims, the District Court ruled that Novak had infringed Mutual’s trademarks. The District Court found that Novak’s use of the design created a likelihood of confusion as to Mutual’s sponsorship of or affiliation with Novak’s merchandise, and therefore held such use to be in violation of both federal and state law. Accordingly, the District Court permanently enjoined Novak from advertising or marketing T-shirts, coffee mugs, and other products featuring the designations “Mutant of Omaha,” “Mutant Kingdom,” and “Mutant of Omaha’s Mutant Kingdom,” or confusingly similar designations, and also permanently enjoined Novak from using as a logo a design confusingly similar to Mutual’s “Indian head” logo.
Like most trademark cases, this case revolves around the “likelihood of confusion” issue. See, e.g., WSM, Inc. v. Hilton, 724 F.2d 1320 (8th Cir.1984); Vitek Sys., Inc. v. Abbott Laboratories, 675 F.2d 190 (8th Cir.1982); SquirtCo v. Seven-Up Co., 628 F.2d 1086 (8th Cir.1980). Specifically, the ultimate issue here is whether Novak’s design so resembles Mutual’s marks that it is likely to cause confusion among consumers as to whether Mutual has sponsored, endorsed, or is otherwise affiliated with the design. See Jordache Enters. v. Hogg Wyld, Ltd., 828 F.2d 1482, 1484 (10th Cir.1987); Kentucky Fried Chicken Corp. v. Diversified Packaging Corp., 549 F.2d 368, 388 (5th Cir.1977). Likelihood of confusion is a question of fact. WSM, Inc., 724 F.2d at 1329; Vitek Sys., 675 F.2d at 192; SquirtCo, 628 F.2d at 1091; Armstrong Cork Co. v. World Carpets, Inc., 597 F.2d 496, 501 (5th Cir.), cert. denied, 444 U.S. 932,100 S.Ct. 277, 62 L.Ed.2d 190 (1979). Thus, we can set aside the District Court’s finding of a likelihood of confusion only if it is clearly erroneous. Anderson v. City of Bessemer City, 470 U.S. 564, 573, 105 S.Ct. 1504, 1511, 84 L.Ed. 2d 518 (1985); Rogers v. Masem, 788 F.2d [399]*3992. We do not find it necessary to reach Mutual’s disparagement claim. Deciding this issue would not affect the remedy already obtained under the infringement claim. "It is a uniform course of appellate review procedure to decline to review questions not necessary to a decision by an appellate court.” Hutchinson Utils. Comm’n v. Curtiss-Wright Corp., 775 F.2d 231, 238 (8th Cir.1985) (quoting Highland Supply Corp. v. Reynolds Metals Co., 327 F.2d 725, 729 (8th Cir.1964)).
In resolving the likelihood of confusion issue, the District Court considered the factors that this Court enumerated in SquirtCo, 628 F.2d at 1091: 1) the strength of the trademark; 2) the similarity between the trademark and the defendant’s mark; 3) the competitive proximity of the products on which the respective marks are placed; 4) the intent of the alleged infringer to pass off his goods as those of the trademark holder; 5) the incidents of actual confusion; and 6) the degree of care likely to be exercised by potential customers of the trademark holder.3 We have continued to give weight to the SquirtCo factors in subsequent cases. See, e.g., WSM, Inc., 724 F.2d at 1329; Vitek Sys., 675 F.2d at 192-93.
The first factor is undisputed. The parties agree that Mutual’s trademarks are strong.
With respect to the second factor, the District Court concluded that Novak’s design is “very similar” to Mutual’s marks. Mutual of Omaha Ins. Co. v. Novak, 648 F.Supp. 905, 909 (D.Neb.1986). We do not disagree. The letters and styles of the phrases are virtually identical. Novak’s “Indian head” logo depicts a side view of a feather-bonneted head similar to Mutual’s “Indian head” logo. And use of the word “Mutant” in place of “Mutual” is, in the context of Novak’s design, suggestive of Mutual.4
Regarding competitive proximity, Novak puts his design on T-shirts and coffee mugs, the same types of items on which Mutual puts its marks. Mutual sells such items to agents and company representatives, who in turn use them as gifts or incentives. While the District Court determined that there was little or no direct competition in these items between the parties, it noted that infringement still could be found. Mutual of Omaha Ins. Co., 648 F.Supp. at 910. This is undoubtedly so, for confusion, not competition, is the touchstone of trademark infringement. See SquirtCo, 628 F.2d at 1091; Hanson v. Triangle Publications, Inc., 163 F.2d 74, 78 (8th Cir.1947), cert. denied, 332 U.S. 855, 68 S.Ct. 387, 92 L.Ed. 424 (1948). It is error to assume that trademark law protects against use of a mark only on directly competitive products. See Kentucky Fried Chicken, 549 F.2d at 388 (Fifth Circuit has “repeatedly rejected” the argument that “infringement occurs only when the alleged infringer uses the mark on the same category of product with respect to which the trademark owner obtained the mark”). “The law of trademarks ... is not so ossified, nor its protective scope so niggardly.” PGA v. Bankers Life & Casualty Co., 514 F.2d 665, 669 (5th Cir.1975). Moreover, by putting his design on items similar to those on which Mutual puts its marks, Novak increased the likelihood of confusion.
[400]*400With regard to the fourth factor, there is no finding by the District Court that Novak intended to pass off his goods as Mutual’s, and it seems clear that he did not. This cuts in Novak’s favor, but it is not dispositive, for intent to pass off one’s goods as another’s is not essential to an infringement claim; rather, its presence or absence is only one factor to be considered along with the other factors that bear on the issue of likelihood of confusion. SquirtCo, 628 F.2d at 1091.
As to incidents of actual confusion, Mutual produced evidence of actual confusion in the form of a survey conducted by Sorenson Marketing and Management Corporation of New York. We consider this appropriate, for surveys are often used to demonstrate actual consumer confusion. PPX Enters, v. Audiofidelity Enters., 818 F.2d 266, 271 (2d Cir.1987). Sorenson interviewed at random four hundred people over the age of twenty-one in New York, Denver, Chicago, and San Francisco. While viewing Novak’s design on a T-shirt, approximately forty-two percent of those surveyed said that Mutual of Omaha came to mind. Plaintiff's Exhibit No. 49, pp. 15, 33. Of that group, twenty-five percent said that they believe Mutual “goes along” with the T-shirts “in order to help make people aware of the nuclear war problem.” See id. at 16. Thus, approximately ten percent of all the persons surveyed thought that Mutual “goes along” with Novak’s product. Id. at 16, 33. Because manifestations of actual confusion serve as strong evidence of a likelihood of confusion, SquirtCo, 628 F.2d at 1091; World Carpets, Inc. v. Dick Littrell’s New World Carpets, 438 F.2d 482, 489 (5th Cir.1971), and may, in fact, be the best such evidence, Jordache Enters., 828 F.2d at 1487, this survey should be given substantial weight unless seriously flawed. See McDonald’s Corp. v. McBagel’s, Inc., 649 F.Supp. 1268, 1277-78 (S.D.N.Y.1986).
The District Court acknowledged that there may be some ambiguity in the “goes along” question used in the survey, but found the survey as a whole “credible evidence of a likelihood of confusion as to source or sponsorship.” Mutual of Omaha Ins. Co., 648 F.Supp. at 911. Novak presents no persuasive reason for overriding the District Court’s evaluation of the reliability of the survey.5 Hence, we can[401]*401not say that the District Court erred in giving the survey significant weight. Courts frequently give substantial weight to properly conducted surveys. See Anheuser-Busch Inc. v. Stroh Brewery Co., 750 F.2d 631, 639 (8th Cir.1984); also SquirtCo, 628 F.2d at 1091; Union Carbide Corp. v. Ever-Ready Inc., 531 F.2d 366, 380-81, 385-87 (7th Cir.), cert. denied, 429 U.S. 830, 97 S.Ct. 91, 50 L.Ed.2d 94 (1976); Humble Oil & Ref. Co. v. American Oil Co., 405 F.2d 803, 817 (8th Cir.), cert. denied, 395 U.S. 905, 89 S.Ct. 1745, 23 L.Ed.2d 218 (1969).6
Concerning the final SquirtCo factor, the District Court found that consumers are not likely to exercise the “high degree of care or thought” necessary to “distinguish Mutual from the message on [Novak’s] products.” Mutual of Omaha Ins. Co., 648 F.Supp. at 911. We agree. Nothing in the labeling or packaging of Novak’s products indicates that the message and products do not emanate from Mutual. As a result, for consumers to learn that Mutual has no connection with Novak’s products requires more than just careful scrutiny of the products, and it is improbable that consumers will engage in further investigation. We believe, as did the District Court, that the degree of care likely to be exercised by consumers does not reduce the likelihood of confusion.7
We are satisfied that the District Court properly weighed the SquirtCo factors. The record contains ample support for the District Court’s finding of a likelihood of confusion. We therefore cannot say that this pivotal finding is clearly erroneous.
The cases Novak relies upon to support his view that there is no likelihood of confusion here, but merely obvious parody, lack persuasiveness in relation to the situation before us. Those cases either did not involve surveys demonstrating confusion or involved surveys of doubtful validity. For example, in Carson v. Here’s Johnny Portable Toilets, Inc., 698 F.2d 831 (6th Cir.1983), the plaintiffs presented no surveys demonstrating confusion, and in Tetley, Inc. v. Topps Chewing Gum, Inc., 556 F.Supp. 785, 793 (E.D.N.Y.1983), the court noted that the plaintiff presented no evidence at all of either the likelihood of or actual confusion. Similarly, none of the following cases relied on by Novak involved surveys demonstrating confusion: Bi-Rite Enters., Inc. v. Button Master, 555 F.Supp. 1188, 1196 (S.D.N.Y.1983) (“plaintiffs have not even attempted to prove confusion in the sense required by the [Lanham] Act”); Reddy Communications, Inc. v. Environmental Action [402]*402Found., Inc., 199 U.S.P.Q. (BNA) 630, 635-36 (D.D.C.1977) (no surveys or evidence of actual confusion); General Mills, Inc. v. Henry Regnery Co., 421 F.Supp. 359, 361 (N.D.Ill.1976) (“no ... evidence of actual confusion and no surveys of consumer attitudes were presented by plaintiff”); Girl Scouts of United States v. Personality Posters Mfg. Co., 304 F.Supp. 1228, 1231 (S.D.N.Y.1969) (“not a scintilla [of evidence] has been presented supporting the allegation of confusion or its likelihood”). In Jordache, there was a survey, but the survey was given little weight because it had been shown to be seriously defective. See Jordache Enters., Inc. v. Hogg Wyld, Ltd., 625 F.Supp. 48, 54 (D.N.M.1985), aff'd, 828 F.2d 1482 (10th Cir.1987) (court finds problems with survey’s setting, sample size, methodology, and computations). Similarly, in American Footwear, the Second Circuit affirmed a district court’s rejection of survey evidence, finding “numerous deficiencies inherent in the surveys.” American Footwear Corp. v. General Footwear Co., 609 F.2d 655, 663 (2d Cir.1979), cert. denied, 445 U.S. 951, 100 S.Ct. 1601, 63 L.Ed.2d 787 (1980).
Novak argues that his use of the design in question is an exercise of his right of free speech and is protected by the First Amendment. We believe, however, that the protection afforded by the First Amendment does not give Novak license to infringe the rights of Mutual. Mutual’s trademarks are a form of property, Hanover Star Milling Co. v. Metcalf, 240 U.S. 403, 413, 36 S.Ct. 357, 360, 60 L.Ed. 713 (1916); Hamilton-Brown Shoe Co. v. Wolf Bros. & Co., 240 U.S. 251, 259, 36 S.Ct. 269, 271, 60 L.Ed. 629 (1916); Dallas Cowboys Cheerleaders, Inc. v. Pussycat Cinema, Ltd., 604 F.2d 200, 206 (2d Cir.1979); J. McCarthy, Trademarks and Unfair Competition § 2:6 (1973), and Mutual’s rights therein need not “yield to the exercise of First Amendment rights under circumstances where adequate alternative avenues of communication exist.” Lloyd Corp. v. Tanner, 407 U.S. 551, 567, 92 S.Ct. 2219, 2228, 33 L.Ed.2d 131 (1972); accord Dallas Cowboys Cheerleaders, Inc., 604 F.2d at 206; see also Walt Disney Prods, v. Air Pirates, 581 F.2d 751, 758-59 (9th Cir.1978), cert. denied, 439 U.S. 1132, 99 S.Ct. 1054, 59 L.Ed.2d 94 (1979); Reddy Communications, Inc., 199 U.S.P.Q. (BNA) at 634. Given the circumstances of this case, Mutual's property rights should not yield. The injunction our decision upholds prohibits Novak's conduct only insofar as Novak uses Mutual’s marks as logos or “to market, advertise, or identify [his] services or products.” Designated Record (D.R.) at 76-77. Other avenues for Novak to express his views exist and are unrestricted by the injunction; for example, it in no way infringes upon the constitutional protection the First Amendment would provide were Novak to present an editorial parody in a book, magazine, or film. Because the injunction leaves open many such avenues of expression, it deprives neither Novak nor the public of the benefits of his ideas. We therefore conclude that in the circumstances of this case failure to protect Mutual’s trademark rights would amount to an “unwarranted infringement of property rights,” for it would “diminish [those] rights without significantly enhancing the asserted right of free speech.” Lloyd Corp., 407 U.S. at 567, 92 S.Ct. at 2228. See Zucchini v. Scripps-Howard Broadcasting Co., 433 U.S. 562, 578, 97 S.Ct. 2849, 2859, 53 L.Ed.2d 965 (1977). It follows that the District Court did not violate Novak’s First Amendment rights by issuing the injunction. See Lloyd Corp., 407 U.S. at 567-70, 92 S.Ct. at 2228-29 (“accommodations” must be made between speech and property rights);8 Zacchini, 433 [403]*403U.S. at 569-79, 97 S.Ct. at 2854-59 (1977) (resolution of conflicts between speech and property rights requires balancing of interests).9
We conclude that the District Court’s finding of a likelihood of confusion between Mutual’s valid trademarks and No-vak’s design is not clearly erroneous. That finding warrants the District Court’s issuance of a permanent injunction restricting Novak’s further use of his infringing design.10 Pure Foods, Inc. v. Minute Maid Corp., 214 F.2d 792, 797 (5th Cir.), cert. denied, 348 U.S. 888, 75 S.Ct. 208, 99 L.Ed. 697 (1954); see also SquirtCo, 628 F.2d at 1091.11
The judgment of the District Court is affirmed.