Table 1 Characteristics of second pregnancy in relation to BMI change.
Characteristics | BMI stable | Reduced BMI | Increased BMI | p value* |
|---|---|---|---|---|
n = 118,924 (72.7%) | n = 9 438 (5.8%) | n = 35 126 (21.5%) | ||
Maternal age (years) | 29.82 (4.62) | 28.92 (4.78) | 28.99 (4.99) | <0.001 |
<20 | 777 (0.7%) | 99 (1.0%) | 481 (1.4%) | |
20–29 | 54,761 (46.0%) | 5150 (54.6%) | 18,701 (53.2%) | |
30–35 | 45,001 (37.8%) | 2983 (31.6%) | 10,925 (31.1%) | |
36–40 | 16,129 (13.6%) | 1057 (11.2%) | 4349 (12.4%) | |
≥41 | 2255 (1.9%) | 148(1.6%) | 670 (1.9%) | |
BMI (kg/m2) | 23.44 (4.02) | 24.27 (4.08) | 28.67 (5.35) | <0.001 |
Underweight | 4465 (3.8%) | 509 (5.4%) | 26 (0.1%) | |
Healthy weight | 84,169 (70.8%) | 5,626 (59.6%) | 9266 (26.4%) | |
Overweight | 22,011 (18.5%) | 2,147 (22.7%) | 14,106 (40.2%) | |
Obesity | 8,279 (7.0%) | 1,156 (12.2%) | 11,728 (33.4%) | |
Social class | <0.001 | |||
Not deprived | 26,757 (22.9%) | 1500 (16.2%) | 5201 (15.2%) | |
Deprived | 87,789 (75.3%) | 7261 (78.6%) | 28,048 (82.1%) | |
Missing | 2116 (1.8%) | 474 (5.1%) | 935 (2.7%) | |
Smoking | <0.001 | |||
Non-smoker | 10,8231 (91.0%) | 8055 (85.3%) | 30,673 (87.3%) | |
Smoker | 8647 (7.3%) | 1239 (13.1%) | 3828 (10.9%) | |
Missing | 2046 (1.7%) | 144 (1.5%) | 625 (1.8%) | |
Marital status | <0.001 | |||
Married/cohabiting | 1,12,238 (94.4%) | 8596 (91.1%) | 32274 (91.9%) | |
Single | 6532 (5.5%) | 821 (8.7%) | 2782 (7.9%) | |
Unknown | 140 (0.1%) | 20 (0.2%) | 60 (0.2%) | |
Interpregnancy Interval | <0.001 | |||
<2 years | 66,153 (55.6%) | 4899 (51.9%) | 726 (7.7%) | |
2–5 years | 47,335 (39.8%) | 3813 (40.4%) | 14,328 (40.8%) | |
>5 years | 5434 (4.6%) | 726 (7.7%) | 3689 (10.5%) | |
Year of delivery | <0.001 | |||
1986–1995 | 4989 (4.2%) | 239 (2.5%) | 1176 (3.3%) | |
1996–2005 | 8134 (6.8%) | 789 (8.4%) | 2917 (8.3%) | |
2006–2015 | 1,05,799 (89.0%) | 8410 (89.1%) | 31,032 (88.3%) | |
Country of origin | <0.001 | |||
Aberdeen | 14,538 (12.2%) | 1021 (10.8%) | 4616 (13.1%) | |
Finland | 98,795 (83.1%) | 7354 (77.9%) | 27,940 (79.5%) | |
Malta | 5591 (4.7%) | 1063 (11.3%) | 2570 (7.3%) |
