Table 4.

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*Data source: Suzhou Maternal Child Information System (unpublished data).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