Table 9.15 refers to a case-control study investigating a possible relationship between cataracts and the use of head coverings during the summer. Each case

reporting to a clinic for care for a cataract was matched with a control of the same sex and similar age not having a cataract. The row and column categories refer to the frequency with which the subject used head coverings. Analyze these data using models presented in this chapter. Interpret results.

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Table 9.15 Control Cataract Case Always or Almost Always Frequently Occasionally Never Always or almost always 29 3 3 4 Frequently 5 0 1 1 Occasionally 9 0 2 0 Never 7 3 1 0 Source: J. M. Dolezal et al., Am. J. Epidemiol., 129: 559-568 (1989).