Table 3.
Rubella seronegativity by year of birth among Taiwan-born and non–Taiwan-born pregnant women, Taiwan
| Characteristic | Taiwan | Non-Taiwan | Non-Taiwan vs. Taiwan | |
|---|---|---|---|---|
| No. negative/total (%) | No. negative/total (%) | Odds ratio (95% confidence interval)* | P | |
| Total | 970/8169 (11.9) | 445/1920 (23.1) | 2.24 (1.98–2.54) | < 0.001 |
| Year of birth | ||||
| < 1966 | 76/263 (28.9) | 7/21 (33.3) | 1.23 (0.48–3.17) | 0.417 |
| 1966–1970 | 303/1030 (29.4) | 15/86 (17.4) | 0.51 (0.29–0.90) | 0.010 |
| 1971–1975 | 216/2340 (9.2) | 43/248 (17.3) | 2.07 (1.44–2.95) | < 0.001 |
| 1976–1980 | 196/2885 (6.8) | 145/643 (22.6) | 4.00 (3.16–5.05) | < 0.001 |
| > 1980 | 179/1615 (10.8) | 235/922 (25.5) | 2.81 (2.27–3.49) | < 0.001 |
| Born before and after vaccination | ||||
| Before 9/1971 | 442/1568 (28.2) | 25/122 (20.5) | 0.66 (0.42–1.03) | 0.067 |
| 9/1971 and after | 528/6601 (8.0) | 420/1798 (23.4) | 3.51 (3.05–4.04) | < 0.001 |
*
Taiwan-born pregnant women were used as the reference group.