Table 4. CIR according to 4 groups stratified by individual and district-level SES.
| Groups | SES | CIR, % | 95% CI | RR | P value for group or pairwise P value | |||
|---|---|---|---|---|---|---|---|---|
| Individual | District-level | |||||||
| Individual SES | Lower | 8.7 | 8.64–8.70 | 1.9 | < 0.001* | |||
| Higher (reference) | 4.1 | 4.08–4.10 | ||||||
| District-level SES | Lower | 4.7 | 4.52–4.86 | 1.1 | 0.026* | |||
| Higher (reference) | 4.3 | 4.06–4.44 | ||||||
| Stratified | ||||||||
| 1 (ILDL) | Lower | Lower | 9.1 | 8.33–9.88 | 2.4 | 1 vs. 2 | 1 vs. 3 | 1 vs. 4 |
| 0.131 | < 0.001* | < 0.001* | ||||||
| 2 (ILDH) | Lower | Higher | 8.1 | 7.24–8.90 | 2.1 | 2 vs. 3 | 2 vs. 4 | |
| < 0.001* | < 0.001* | |||||||
| 3 (IHDL) | Higher | Lower | 4.2 | 4.07–4.42 | 1.1 | 3 vs. 4 | ||
| 0.065 | ||||||||
| 4 (IHDH, reference) | Higher | Higher | 3.9 | 3.67–4.05 | ||||
CIR = cumulative incidence rate, SES = socioeconomic status, CI = confidence interval, RR = relative risk, ILDL = having individual lower SES and district-level lower SES, ILDH = having individual lower SES and district-level higher SES, IHDL = having individual higher SES and district-level lower SES, IHDH = having individual higher SES and district-level higher SES.
*P < 0.05.