Table 1.
Distribution of exposure variables and vaccination status at the last school health examination among the sub-cohort
| Vaccinia at the last school health examinationa |
BCG at the last school health examinationa |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| No | Yes | RRb | Joint chi square test, P-value | No | Yes | RRb | Joint chi square test, P-value | ||
| n = 2298 | n = 3018 | (95% CI) | n = 1227 | n = 4089 | (95% CI) | ||||
| Sex | |||||||||
| Females | 42.4% (1090) | 58.6% (1544) | 1 (ref) | 22.9% (604) | 77.1% (2030) | 1 (ref) | |||
| Males | 45.0% (1208) | 55.0% (1474) | 0.98 (0.96–1.00) | 23.2% (623) | 76.7% (2059) | 0.99 (0.97–1.02) | |||
| Eczema | |||||||||
| Not reported | 42.2% (2113) | 57.8% (2889) | 1 (ref) | 22.5% (1127) | 77.5% (3875) | 1 (ref) | |||
| Yes | 58.9% (185) | 41.1% (129) | 0.89 (0.82–0.96) | 31.9% (100) | 68.2% (214) | 0.92 (0.86–0.99) | |||
| Family social class | |||||||||
| I | 51.4% (196) | 48.6% (185) | 1 (ref) | 0.01 | 29.4% (112) | 70.6% (269) | 1 (ref) | 0.002 | |
| II | 46.9% (317) | 53.1% (359) | 1.01 (0.95–1.07) | 20.4% (138) | 79.6% (538) | 1.04 (0.98–1.11) | |||
| III | 41.4% (368) | 58.6% (520) | 1.01 (0.96–1.06) | 22.1% (196) | 77.9% (692) | 1.00 (0.95–1.06) | |||
| IV | 40.7% (760) | 59.3% (1108) | 1.02 (0.97–1.07) | 21.8% (408) | 78.2% (1460) | 1.01 (0.96–1.07) | |||
| V | 40.9% (478) | 59.1% (691) | 0.98 (0.93–1.03) | 24.0% (280) | 76.1% (889) | 0.97 (0.91–1.02) | |||
| Unclassified | 53.6% (179) | 46.4% (155) | 0.91 (0.84–0.99) | 27.8% (93) | 72.2% (241) | 0.94 (0.87–1.01) | |||
aIn this table, the distribution of vaccination status follows the status at the last health examination. In the Cox proportional hazards analyses, individuals are allowed to change vaccination status (except as in Supplementary Table 7).
bRisk ratios (RR) are calculated with binomial regression and adjusted for other variables in the table as well as birth cohort from 1965–68, 1969–72 and 1973–76.