Kass, J.
Donna Adams, a school teacher in Wareham, applied to the Teachers’ Retirement Board for disability retirement “by reason of a personal injury sustained or a hazard undergone as a result of, and while in the performance of, [her] duties.” G. L. c. 32, § 7(1), as appearing in St. 1982, c. 630, § 18. Her case has been in this court before. See Adams v. Contributory Retirement Appeal Bd., 26 Mass. App. Ct. 1032 (1989) (Adams I).
In considering whether the disability Donna Adams suffered was work related, it is useful to rehearse the principles governing what constitutes a compensable injury in the related area of workers’ compensation. See Blanchette v. Contributory Retirement Appeal Bd., 20 Mass. App. Ct. 479, 485 (1985). Those principles were restated in Zerofski’s Case, 385 Mass. 590, 594-595 (1982):
“The line between compensable injury and mere ‘wear and tear’ is a delicate one .... Nevertheless, the distinction is necessary to preserve the basic character of the act .... To be compensable, injury must arise ‘out of as well as ‘in the course of employment .... To be compensable, the harm must arise either from a specific incident or series of incidents at work, or from an identifiable condition that is not common and necessary to all or a great many occupations. The injury need not be unique to the trade, and need not, of course, result from the fault of the employer. But it must, in the sense we have described, be identified with the employment.”
In Zer of ski’s Case, years of standing and walking at work did not meet the statutory requirement because standing and walking are common to a great many occupations.
As in the earlier appeal, Adams I, the Contributory Retirement Appeal Board (CRAB) denied the application of Adams for disability retirement; Adams took an appeal from that administrative agency to the Superior Court under G. L. c. 30A, § 14(7); and a judge of that court ruled that CRAB had incorrectly applied the Zerofski principles. Conse[173]*173quently, the judge determined, CRAB had acted arbitrarily and capriciously and ordered payment of disability benefits to Adams. From a judgment entered accordingly, CRAB has again appealed. We affirm the judgment of the Superior Court ordering retirement benefits.
The burden carried by a claimant for disability retirement, such as Adams, breaks down into two interrelated factors: (1) Did something which happened in the workplace cause the injury? (2) Assuming that connection, if the cause was not a specific or series of specific incidents, could what happened in the workplace be differentiated from conditions and physical demands that are common and necessary to all or a great many occupations? As to the causation factor, see Campbell v. Contributory Retirement Appeal Bd., 17 Mass. App. Ct. 1018, 1018-1019 (1984); Blanchette v. Contributory Retirement Appeal Bd., 20 Mass. App. Ct. at 485; as to distinctive factors in the work place, see Zerofski’s Case, 385 Mass. at 594-595; Blanchette v. Contributory Retirement Appeal Bd., 20 Mass. App. Ct. at 487.
At this juncture, it is helpful to summarize the findings of an administrative magistrate of the Division of Administrative Law Appeals, which CRAB in large measure adopted.1
[174]*174Adams had been employed by Wareham as a third-grade teacher for approximately fourteen years before severe back pain prevented her from working. Her duties as a teacher required her to help her young pupils to tie their shoes, to fasten their belts, and to put on their boots, to help them with their lunches, to break up fights between them, and to run after children and fetch them back when they wandered toward nearby unguarded railroad tracks. In addition to walking and standing, Adams’s work required frequent bending to deal with third-grade children.
As a child, Adams had suffered a bout of poliomyelitis which caused paralysis of her left leg and required her to walk with the aid of a long leg brace. That compounded a club foot difficulty with the same leg which Adams had experienced since birth. In January, 1980, Adams delivered a child by Caesarian section. She experienced no back pain in caring for her baby. In the fall of 1980, Adams resumed teaching and in February, 1981, began to experience back pain. No particular incident triggered the onset of her pain. After a medically prescribed period of bed rest, Adams returned to the classroom half days but soon suffered back pain again. A series of medical consultations and therapies followed, none of which succeeded in alleviating Adams’s back problem. It was the opinion of Dr. William' W. Tomford, an orthopedic surgeon at Massachusetts General Hospital, that a return to work would exacerbate her pain. Adams applied for disability retirement.
The Teachers’ Retirement Board rejected Adams’s application and she appealed to CRAB. The hearing magistrate concluded that Adams’s “pre-existing condition of residuals from childhood polio was aggravated by the continual standing, bending and moving about activities involved in her teaching work to produce her disabling back condition.” Applying the Zerofski test, the hearing magistrate found “that Ms. Adams’s particular regime does not reflect an activity level commmon or necessary to daily life or to all employ[175]*175ment . . . her regime of activity involves physical movements and exertions which are dependent upon whatever the situation demanded to insure proper care for the young children.” The magistrate recommended that benefits be awarded.
When we reviewed the administrative record in Adams I, we questioned whether there was support for CRAB’s findings “that in all likelihood [the plaintiffs] medical problems were brought on by the care and birth of her child.” Adams I at 1034. We ordered that the case be remanded to CRAB so that it might explain why it thought the record tied Adams’s disability to the birth and care of her child. Our opinion requested the board to refer to the evidence on which it had relied to arrive at its ultimate finding about the cause of Adams’s disability.
CRAB chose not to hold further hearings (nor was it required so to do). As recited in note 1, supra, CRAB, in its response after remand, disavowed acceptance of finding 38 of the administrative magistrate, which had tied the claimant’s disability to the standing, bending, and moving about activities involved in Adams’s teaching work. The board did not, however, explain the basis of its earlier conclusion that the birth and care of her child had brought on Adams’s back injury. There was absent from CRAB’s response to Adams I any reference to evidence to support the birth and child care causation hypothesis. Rather, CRAB shifted ground on causation altogether in its decision filed after remand, this time finding the causes of Adams’s injury in her birth defect and in her childhood poliomyelitis. The failure to respond to our inquiries in Adams I about causation works something resembling a waiver by the agency of the causation issue. When faced, after remand, with a failure by an administrative agency to respond to a request to furnish a reasoned basis for the agency’s conclusion, a reviewing court may come to a more readily apparent conclusion. See Marshall v. Lansing, 839 F.2d 933, 945 (3d Cir.
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Kass, J.
Donna Adams, a school teacher in Wareham, applied to the Teachers’ Retirement Board for disability retirement “by reason of a personal injury sustained or a hazard undergone as a result of, and while in the performance of, [her] duties.” G. L. c. 32, § 7(1), as appearing in St. 1982, c. 630, § 18. Her case has been in this court before. See Adams v. Contributory Retirement Appeal Bd., 26 Mass. App. Ct. 1032 (1989) (Adams I).
In considering whether the disability Donna Adams suffered was work related, it is useful to rehearse the principles governing what constitutes a compensable injury in the related area of workers’ compensation. See Blanchette v. Contributory Retirement Appeal Bd., 20 Mass. App. Ct. 479, 485 (1985). Those principles were restated in Zerofski’s Case, 385 Mass. 590, 594-595 (1982):
“The line between compensable injury and mere ‘wear and tear’ is a delicate one .... Nevertheless, the distinction is necessary to preserve the basic character of the act .... To be compensable, injury must arise ‘out of as well as ‘in the course of employment .... To be compensable, the harm must arise either from a specific incident or series of incidents at work, or from an identifiable condition that is not common and necessary to all or a great many occupations. The injury need not be unique to the trade, and need not, of course, result from the fault of the employer. But it must, in the sense we have described, be identified with the employment.”
In Zer of ski’s Case, years of standing and walking at work did not meet the statutory requirement because standing and walking are common to a great many occupations.
As in the earlier appeal, Adams I, the Contributory Retirement Appeal Board (CRAB) denied the application of Adams for disability retirement; Adams took an appeal from that administrative agency to the Superior Court under G. L. c. 30A, § 14(7); and a judge of that court ruled that CRAB had incorrectly applied the Zerofski principles. Conse[173]*173quently, the judge determined, CRAB had acted arbitrarily and capriciously and ordered payment of disability benefits to Adams. From a judgment entered accordingly, CRAB has again appealed. We affirm the judgment of the Superior Court ordering retirement benefits.
The burden carried by a claimant for disability retirement, such as Adams, breaks down into two interrelated factors: (1) Did something which happened in the workplace cause the injury? (2) Assuming that connection, if the cause was not a specific or series of specific incidents, could what happened in the workplace be differentiated from conditions and physical demands that are common and necessary to all or a great many occupations? As to the causation factor, see Campbell v. Contributory Retirement Appeal Bd., 17 Mass. App. Ct. 1018, 1018-1019 (1984); Blanchette v. Contributory Retirement Appeal Bd., 20 Mass. App. Ct. at 485; as to distinctive factors in the work place, see Zerofski’s Case, 385 Mass. at 594-595; Blanchette v. Contributory Retirement Appeal Bd., 20 Mass. App. Ct. at 487.
At this juncture, it is helpful to summarize the findings of an administrative magistrate of the Division of Administrative Law Appeals, which CRAB in large measure adopted.1
[174]*174Adams had been employed by Wareham as a third-grade teacher for approximately fourteen years before severe back pain prevented her from working. Her duties as a teacher required her to help her young pupils to tie their shoes, to fasten their belts, and to put on their boots, to help them with their lunches, to break up fights between them, and to run after children and fetch them back when they wandered toward nearby unguarded railroad tracks. In addition to walking and standing, Adams’s work required frequent bending to deal with third-grade children.
As a child, Adams had suffered a bout of poliomyelitis which caused paralysis of her left leg and required her to walk with the aid of a long leg brace. That compounded a club foot difficulty with the same leg which Adams had experienced since birth. In January, 1980, Adams delivered a child by Caesarian section. She experienced no back pain in caring for her baby. In the fall of 1980, Adams resumed teaching and in February, 1981, began to experience back pain. No particular incident triggered the onset of her pain. After a medically prescribed period of bed rest, Adams returned to the classroom half days but soon suffered back pain again. A series of medical consultations and therapies followed, none of which succeeded in alleviating Adams’s back problem. It was the opinion of Dr. William' W. Tomford, an orthopedic surgeon at Massachusetts General Hospital, that a return to work would exacerbate her pain. Adams applied for disability retirement.
The Teachers’ Retirement Board rejected Adams’s application and she appealed to CRAB. The hearing magistrate concluded that Adams’s “pre-existing condition of residuals from childhood polio was aggravated by the continual standing, bending and moving about activities involved in her teaching work to produce her disabling back condition.” Applying the Zerofski test, the hearing magistrate found “that Ms. Adams’s particular regime does not reflect an activity level commmon or necessary to daily life or to all employ[175]*175ment . . . her regime of activity involves physical movements and exertions which are dependent upon whatever the situation demanded to insure proper care for the young children.” The magistrate recommended that benefits be awarded.
When we reviewed the administrative record in Adams I, we questioned whether there was support for CRAB’s findings “that in all likelihood [the plaintiffs] medical problems were brought on by the care and birth of her child.” Adams I at 1034. We ordered that the case be remanded to CRAB so that it might explain why it thought the record tied Adams’s disability to the birth and care of her child. Our opinion requested the board to refer to the evidence on which it had relied to arrive at its ultimate finding about the cause of Adams’s disability.
CRAB chose not to hold further hearings (nor was it required so to do). As recited in note 1, supra, CRAB, in its response after remand, disavowed acceptance of finding 38 of the administrative magistrate, which had tied the claimant’s disability to the standing, bending, and moving about activities involved in Adams’s teaching work. The board did not, however, explain the basis of its earlier conclusion that the birth and care of her child had brought on Adams’s back injury. There was absent from CRAB’s response to Adams I any reference to evidence to support the birth and child care causation hypothesis. Rather, CRAB shifted ground on causation altogether in its decision filed after remand, this time finding the causes of Adams’s injury in her birth defect and in her childhood poliomyelitis. The failure to respond to our inquiries in Adams I about causation works something resembling a waiver by the agency of the causation issue. When faced, after remand, with a failure by an administrative agency to respond to a request to furnish a reasoned basis for the agency’s conclusion, a reviewing court may come to a more readily apparent conclusion. See Marshall v. Lansing, 839 F.2d 933, 945 (3d Cir. 1988). We, therefore, take as established in this case that her activities in the workplace were the natural and proximate cause of Adams’s back in[176]*176jury. Cf. Morris v. Board of Registration in Med., 405 Mass. 103, 112-113 (1989).
It remains to consider the second question we put to CRAB in Adams I at 1035: whether Adams’s job requirements as an elementary school teacher subjected her to an identifiable condition not common and necessary to all or a great many occupations; i.e., to apply the principles restated in Zerofski’s Case, 385 Mass. at 594-595. We asked for the benefit of the board’s views in light of its “experience in the area and its function in applying the controlling statute, necessarily on a case-by-case basis, to a difficult area of the law.” Blanchette v. Contributory Retirement Appeal Bd., 20 Mass. App. Ct. at 487.
CRAB responded that Adams’s injury resulted from the “wear and tear” of physical demands which she would have experienced in any number of occupations. As examples of occupations which required persons to stand, walk or bend, CRAB cited: “homemakers, doctors, nurses, waiters, chefs, laborers, patrolmen, correctional officers, janitors, tradesmen, watchmen, salespersons, metermaids, baseball players and umpires.”
Yet baseball players surely (to choose the most obvious example from CRAB’s list) meet exceptional physical demands; if they do not, society overpays them. The point is that recovery under G. L. c. 32, § 7(1), does not require that an identifiable condition on the job be unique to a particular occupation. Blanchette v. Contributory Retirement Appeal Bd., 20 Mass. App. Ct. at 487 n.7. It is necessary to establish that the injury arose out of an identifiable exertion which the employee occupationally is called upon to make and which can be thought to have caused injury to the employee for reasons other than that the employee just wearing out — as we all do. Some of the other occupations listed by CRAB illustrate the point. A doctor, nurse, waiter, or chef obliged to engage in exceptional and frequent bending or other assumption of a strenuous posture is exposed to a condition of employment not common and necessary to all or a great many occupations. The connection between bending and [177]*177backache has been recognized in this context. See McManus’s Case, 328 Mass. 171, 173 (1951); Zerofski’s Case, 385 Mass. at 593.
Frequency and intensity of activity compared to other occupations are factors in deciding whether the activity will support a claim for benefits after injury. The lines of distinction, as we have observed, are delicate, Zerofski’s Case, 385 Mass. at 594. As an initial matter the drawing of the lines is a task for the administrative agency, and the agency’s determination is entitled to the usual deference. Ultimately, though, the line is for a court to draw as it did in Zerofski, at 595. Cf. Massachusetts Retired Police & Firefighters Assn., Inc. v. Retirement Bd. of Belmont, 15 Mass. App. Ct. 212, 217 (1983). That is particularly so when the agency disregards the findings of its hearing officer and offers no reasoned analysis for having come to the opposite conclusion. See Morris v. Board of Registration in Med., 405 Mass. at 112-113. We are of opinion that Adams’s duties exposed her to an identifiable condition which is not common to most occupations. Bending may be common to everyday life and, to a certain degree, the teaching profession. Bending to help or grapple with some thirty wriggling third graders is not as commonplace. Constant bending over because of the size of the children Adams taught distinguishes her work not only from other occupations, but other teaching. In addition to the thirty or so students in her classroom, Adams was required to monitor between 660 and 800 small students at recess or lunch, times when her young charges were particularly likely to mount physical challenges. This was bending which was deeper, more frequent, and more intense than that which would be expected in the general run of occupations.
As her injury was the natural and proximate result of a job condition which is identifiably distinct, Adams is entitled to disability benefits under G. L. c. 32, § 7(1).
Judgment affirmed.