Table 1 Demographic characteristics of study population based on vaccination history

Mother’s age ,mean (SD),y

31.33(5.75)

31.16(5.67)

<0.001

multiparous

10,737( 61.41 )

61,107(54.56)

Baseline

nulliparous

6,748(38.59)

50,896(45.44)

<0.001

Educational level ,y

17,304

111,152

≤9

3,169(18.31)

12,284( 11.05)

Baseline

10-12

6,972(40.29)

44,176(39.74)

<0.001

>12

7,163(41.40)

54,692(49.20)

<0.001

pre pregnancy body mass index,

15,954

101,813

18.5>

133(0.83)

1,607(1.58)

<0.001

18.5-24.9

11,900(74.59)

76,158(74.80)

Baseline

25-29.9

3,112(19.51)

19,624(19.27)

0.49

>30

809(5.07)

4,424(4.35)

<0.001

Maternal underlying medical conditions

2,696(15.46)

15,121(13.53)

<0.001

Chronic hypertension

361(2.07)

1,953(1.75)

0.003

Preeclampsia/ eclampsia

432(2.48)

2,557(2.29)

0.12

diabetes

140(0.80)

689(0.62)

0.004

Gestational diabetes

1,881(10.78)

10,293(9.21)

<0.001

Cardiovascular disease

105(0.60)

815(0.73)

0.06

Smoking or other addictions

9(0.05)

250(0.22)

<0.001