RELATIONSHIP between physical health and the environment has been the focus of much research.Relatively little of this research, however, has been controlled, that is, it has not included comparisons over time of the health behavior of a group that has experienced environ- mental improvements with the health behavior of a similar group experiencing none (1,2).While observations made at one point in time can show correlation, they cannot show causation.To estab- lish causation, two conditions must be met.First,
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Wambem et al. (1973) studied this question.
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