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Table 3 Socio Demographic and Clinical Characteristics of Pregnant Women by Hemoglobin Concentration for India

From: Hemoglobin concentrations and adverse birth outcomes in South Asian pregnant women: findings from a prospective Maternal and Neonatal Health Registry

Maternal Characteristics

Overall1 N (%)

Maternal Hemoglobin g/dL1, N (%)

P-value2

Very low(<  7.0)

Low(7.0–7.9)

Low(8.0–8.9)

Low(9.0–9.9)

Low normal(10.0–10.9)

Normal(11.0–12.9)

High(≥ 13.0)

Deliveries, N

112,734

268 (0.2)

992 (0.9)

8037 (7.1)

42,460 (37.7)

43,530 (38.6)

16,163 (14.3)

1284 (1.1)

 

Maternal age, N (%)

        

<.0001

  < 20

7496 (6.7)

31 (0.4)

81 (1.1)

488 (6.5)

2470 (33.0)

2684 (35.8)

1522 (20.3)

220 (2.9)

 

 20–35

104,760 (93.0)

236 (0.2)

908 (0.9)

7504 (7.2)

39,835 (38.0)

40,651 (38.8)

14,565 (13.9)

1061 (1.0)

 

  > 35

446 (0.4)

1 (0.2)

3 (0.7)

41 (9.2)

138 (30.9)

186 (41.7)

74 (16.6)

3 (0.7)

 

Education, N (%)

        

<.0001

 No formal education

10,249 (9.1)

67 (0.7)

143 (1.4)

1005 (9.8)

4165 (40.6)

3582 (34.9)

1184 (11.6)

103 (1.0)

 

 Primary/Secondary

86,809 (77.1)

175 (0.2)

761 (0.9)

6295 (7.3)

33,485 (38.6)

33,306 (38.4)

11,834 (13.6)

953 (1.1)

 

 University+

15,551 (13.8)

26 (0.2)

84 (0.5)

731 (4.7)

4766 (30.6)

6586 (42.4)

3130 (20.1)

228 (1.5)

 

Parity, N (%)

        

<.0001

 0

49,929 (44.4)

124 (0.2)

397 (0.8)

3090 (6.2)

17,386 (34.8)

19,867 (39.8)

8332 (16.7)

733 (1.5)

 

 1–3

61,118 (54.3)

138 (0.2)

561 (0.9)

4734 (7.7)

24,366 (39.9)

23,133 (37.8)

7647 (12.5)

539 (0.9)

 

  ≥ 4

1432 (1.3)

6 (0.4)

31 (2.2)

206 (14.4)

598 (41.8)

424 (29.6)

157 (11.0)

10 (0.7)

 

BMI, N (%)

        

<.0001

  < 18.5

41,555 (37.0)

114 (0.3)

427 (1.0)

3854 (9.3)

17,408 (41.9)

14,622 (35.2)

4746 (11.4)

384 (0.9)

 

 18.5–25

64,980 (57.9)

147 (0.2)

532 (0.8)

3932 (6.1)

23,519 (36.2)

26,312 (40.5)

9809 (15.1)

729 (1.1)

 

  ≥ 25

5753 (5.1)

6 (0.1)

26 (0.5)

223 (3.9)

1358 (23.6)

2397 (41.7)

1573 (27.3)

170 (3.0)

 

Multiple pregnancy, N (%)

        

0.2983

 Yes

991 (0.9)

1 (0.1)

14 (1.4)

77 (7.8)

382 (38.5)

356 (35.9)

152 (15.3)

9 (0.9)

 

 No

111,596 (99.1)

266 (0.2)

978 (0.9)

7943 (7.1)

42,022 (37.7)

43,116 (38.6)

15,998 (14.3)

1273 (1.1)

 

Gestational age at enrollment, N (%)

        

<.0001

 1st trimester (<  13,0)

59,855 (53.3)

133 (0.2)

494 (0.8)

4305 (7.2)

22,355 (37.3)

21,711 (36.3)

9771 (16.3)

1086 (1.8)

 

 2nd trimester (13,0-23,6)

38,536 (34.3)

94 (0.2)

366 (0.9)

2794 (7.3)

15,180 (39.4)

15,504 (40.2)

4458 (11.6)

140 (0.4)

 

 3rd trimester/after delivery (≥ 24,0)

13,953 (12.4)

39 (0.3)

127 (0.9)

914 (6.6)

4795 (34.4)

6168 (44.2)

1863 (13.4)

47 (0.3)

 

Inter-delivery interval, N (%)

        

<.0001

  ≤ 12 months

903 (2.4)

4 (0.4)

15 (1.7)

76 (8.4)

347 (38.4)

330 (36.5)

122 (13.5)

9 (1.0)

 

 12–24 months

10,799 (28.9)

20 (0.2)

109 (1.0)

893 (8.3)

4339 (40.2)

3725 (34.5)

1563 (14.5)

150 (1.4)

 

  > 24 months

25,662 (68.7)

75 (0.3)

252 (1.0)

1857 (7.2)

9461 (36.9)

9747 (38.0)

3938 (15.3)

332 (1.3)

 
  1. 1The overall column displays % of each characteristic, while the hemoglobin columns display % of each hemoglobin category within each maternal characteristic subgroup
  2. 2P-values based on a Cochran-Mantel-Haenszel test for row mean differences based on standard mid-rank (modridit) scores stratified by cluster