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Table 2 Comparison of maternal characteristics between ALSPAC (n = 13 798) and 2004 Pelotas (n = 4109) birth cohort studies.

From: Differentials and income-related inequalities in maternal depression during the first two years after childbirth: birth cohort studies from Brazil and the UK

Variable ALSPAC
n(%)
Pelotas
n(%)
P*
Ethnic origin    <0.001
White 11855 (97.4) 3014 (73.4)  
Black/mixed 318 (2.6) 1095 (26.6)  
Maternal age (y)    <0.001
<20 649 (4.7) 773 (18.8)  
20–34 11780 (85.4) 2785 (67.8)  
≥ 35 1369 (9.9) 549 (13.4)  
Marital status    <0.001
With partner 11442 (97.5) 3451 (84.0)  
Single mother 288 (2.5) 658 (16.0)  
Parity    <0.001
0 5672 (45.1) 1624 (39.6)  
1 4388 (34.8) 1082 (26.3)  
≥ 2 2526 (20.1) 1402 (34.1)  
Pre-pregnancy body mass index (kg/m 2 )    <0.001
<18.5 570 (5.0) 187 (4.9)  
18.5 – 24.9 8472 (74.4) 2333 (61.3)  
25.0 – 29.9 1718 (15.1) 873 (23.0)  
≥ 30 627 (5.5) 409 (10.8)  
Antenatal risk    <0.001
Low 2678 (49.7) 717 (18.1)  
Medium 2268 (42.2) 2702 (68.0)  
High 435 (8.1) 551 (13.9)  
Smoking during pregnancy    0.565
No 8179 (75.9) 3099 (75.4)  
Yes 2601 (24.1) 1010 (24.6)  
Multiple birth    0.110
No 13617 (98.7) 4068 (99.0)  
Yes 181 (1.3) 41 (1.0)  
Neonatal problems    0.001
No 11261 (93.3) 3755 (91.7)  
Yes 813 (6.7) 342 (8.4)  
  1. * chi-square