Table 5 Chi-square test for equal probabilities of the levels of the grouping variables among the myopic children
From: Myopia in Bulgarian school children: prevalence, risk factors, and health care coverage
Grouping characteristic | Chi^2 test statistic | Degrees of freedom | P-value |
|---|---|---|---|
Examination before (yes or no) | 44.085 | 1 | < 0.0001 |
Children have glasses (yes or no) | 4.339 | 1 | 0.0373 |
Children wear glasses (yes, no, sometimes) | 119.4 | 2 | < 0.0001 |