TABLE 3—
Preperiod | Postperiod | |||||
Group | No. of Claims | Rate of Claims per Person-Year | No. of Claims | Rate of Claims Per Person-Year | Postperiod-to-Preperiod Rate Ratioa (95% CI) | P |
Total | 4043 | .00994 | 3652 | .00913 | 0.92 (0.88, 0.96) | .0002 |
Sex | ||||||
Male | 1459 | .01285 | 1151 | .01117 | 0.87 (0.80, 0.94) | .0004 |
Female | 2584 | .00881 | 2501 | .00842 | 0.96 (0.91, 1.01) | .11 |
Race | ||||||
White | 1507 | .00896 | 1511 | .00902 | 1.01 (0.94, 1.08) | .85 |
Black | 2336 | .01061 | 1793 | .00861 | 0.81 (0.76, 0.86) | <.0001 |
Other | 200 | .01075 | 348 | .01437 | 1.34 (1.12, 1.59) | .0011 |
Age, y | ||||||
21–44 | 3116 | .01262 | 2790 | .01163 | 0.92 (0.88, 0.97) | .0017 |
45–64 | 867 | .01178 | 759 | .01084 | 0.92 (0.83, 1.01) | .094 |
≥ 65 | 60 | .00069 | 103 | .00114 | 1.65 (1.20, 2.27) | .0021 |
Note. CI = confidence interval.
aReference period is preperiod.