Baseline characteristics of respondents compared with local average of pregnant women in Suzhou, 2015
| Suzhou average (Col. %)* | Study cohort (Col. %) | P values | |
| Age group | |||
| <20 | 2890 (2.2) | 26 (0. 6) | <0.001 |
| 20–24 | 27 388 (20.8) | 765 (16.5) | |
| 25–29 | 63 109 (47.8) | 2671 (57.7) | |
| 30–34 | 30 030 (22.8) | 921 (19.9) | |
| >35 | 8595 (6.5) | 249 (5.4) | |
| Total | 1 32 012 | 4632 | |
| Influenza vaccine | |||
| Vaccinated | 1%† | 0.043% | |
| Education level(n=4616) | |||
| Primary school or lower (Grade 6) | 3014 (2.3) | 18 (0.4) | <0.001 |
| Junior high school (Grade 9) | 29 039 (21.8) | 357 (7.7) | |
| Senior high school (Grade 12) | 28 989 (21.7) | 884 (19.2) | |
| College or higher | 72 476 (54.3) | 3357 (72.7) | |
| Total | 1 33 518 | 4632 | |
*Data source: Suzhou Maternal Child Information System (unpublished data).
†Data source: KAP study among 1600 pregnant women during 2012–2013 in Suzhou, China.15