Table 1 Baseline demographic characteristics of the women separated by symptom group for nausea, vomiting or poor appetite before 37 weeks of pregnancy overall and by trimester

Mean (SD)

Age

22.6 (4.7)

22.6 (4.7)

22.5 (4.7)

22.4 (4.4)

22.4 (4.9)

22.9 (4.9)

Gestational age

17.6 (7.0)

20.1 (6.8)

15.2 (6.3)

9.8 (2.3)

15.7 (5.3)

18.8 (7.1)

Gravidity

2.2 (1.5)

2.1 (1.4)

2.3 (1.5)

2.2 (1.4)

2.2 (1.5)

2.4 (1.7)

Years of education

5.0 (4.8)

5.1 (4.9)

4.8 (4.8)

5.3 (4.8)

4.8 (4.7)

4.4 (4.8)

Total Visits

5.3 (1.9)

4.7 (1.8)

5.9 (1.8)

7.1 (1.4)

5.8 (1.7)

5.3 (1.8)

N (%)

Age

 ≤19

1021 (28.6)

507 (28.3)

514 (29.0)

213 (29.3)

336 (29.9)

135 (26.7)

 20–24

1487 (41.7)

735 (41.0)

752 (42.4)

309 (42.6)

475 (42.3)

214 (42.3)

 25–29

760 (21.3)

409 (22.8)

351 (19.8)

149 (20.5)

215 (19.1)

101 (20.0)

 30–34

223 (6.3)

109 (6.1)

114 (6.4)

46 (6.3)

67 (6.0)

40 (7.9)

 ≥35

78 (2.2)

35 (2.0)

43 (2.4)

9 (1.2)

31 (2.8)

16 (3.2)

Gestational age

 <12

820 (22.6)

232 (12.7)

588 (32.8)

523 (71.6)

254 (22.3)

89 (17.2)

 12–27

2298 (63.4)

1215 (66.4)

1083 (60.4)

208 (28.5)

844 (74.2)

333 (64.4)

 ≥27

505 (13.9)

383 (20.9)

122 (6.8)

-

39 (3.4)

95 (18.4)

 Literate

2103 (60.6)

1076 (61.6)

1027 (59.7)

444 (63.3)

655 (59.9)

265 (53.8)

 No education

1474 (42.5)

738 (42.3)

736 (42.8)

270 (38.5)

465 (42.6)

239 (48.6)

 Smoking

146 (4.1)

76 (4.2)

70 (3.9)

15 (2.1)

45 (4.0)

29 (5.6)

 Flu vaccine

1816 (50.1)

905 (49.5)

911 (50.8)

356 (48.7)

598 (52.6)

265 (51.3)

 Nulliparous

1523 (42.1)

789 (43.1)

734 (40.9)

286 (39.1)

485 (42.7)

197 (38.1)

≥ 1 parity

 Previous miscarriage

254 (12.1)

107 (10.3)

147 (13.9)

65 (14.6)

85 (13.0)

50 (15.6)

 Previous stillbirth

110 (5.2)

52 (5.0)

58 (5.5)

25 (5.6)

31 (4.8)

14 (4.4)