Incidence of RA in Kamitonda population during three time periods, 1965–1975, 1975–1985, and 1985–1996
| 1965–1975 | 1975–1985 | 1985–1996 | trend | |
|---|---|---|---|---|
| Total | ||||
| PY at risk | 22 591 | 22 832 | 32 268 | |
| Number of incident cases | 8 | 5 | 3 | |
| Crude incidence1-150 | 0.35 | 0.22 | 0.09 | |
| Adjusted incidence1-150 † ‡ | 0.39 | 0.24 | 0.08 | p<0.025 (χ2=5.77) |
| (95% CI) | (0.12, 0.66) | (0.03, 0.46) | (0, 0.17) | |
| Men | ||||
| PY at risk | 10 960 | 11 090 | 15 346 | |
| Number of incident cases | 3 | 2 | 3 | |
| Crude incidence1-150 | 0.27 | 0.18 | 0.20 | |
| Adjusted incidence1-150 † | 0.29 | 0.20 | 0.16 | p>0.5 (χ2=0.44) |
| (95% CI) | (0, 0.62) | (0, 0.48) | (0, 0.35) | |
| Women | ||||
| PY at risk | 11 631 | 11 742 | 16 922 | |
| Number of incident cases | 5 | 3 | 0 | |
| Crude incidence1-150 | 0.43 | 0.26 | 0.00 | |
| Adjusted incidence1-150 † | 0.48 | 0.28 | 0.00 | p<0.01 (χ2=7.44) |
| (95% CI) | (0.06, 0.91) | (0, 0.60) | (NC) | |
↵1-150 per 1000PY, †adjusted for age, ‡adjusted for age and sex, CI: confidence intervals, NC: not calculated.