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Table 1 The rate of preeclampsia and giving birth to a small-for-gestational-age (SGA) infant by maternal characteristics

From: Elevated diastolic blood pressure until mid-gestation is associated with preeclampsia and small-for-gestational-age birth: a population-based register study

Maternal characteristics Numbers Preeclampsia SGA births
% p-value % p-value
BPa early gestation    < 0.001   0.049
 Normal 56,491 3.0   3.0  
 Stage 1 hypertensionb 7996 7.0   3.4  
BMIc early gestation (kg/m2)   < 0.001   < 0.001
  < 18.5 1994 2.7   4.8  
 18.5–24.9 44,024 2.9   3.0  
 25–29.9 11,473 4.5   2.7  
  ≥ 30 4025 7.1   3.3  
 Missing 2974 3.3   3.2  
Age (years)    < 0.001   < 0.001
  < 25 9144 3.3   3.0  
 25–29 20,368 3.4   2.7  
 30–34 23,763 3.2   2.9  
  ≥ 35 11,199 4.4   3.8  
 Missing 16 6.3   6.3  
Height (cm)    < 0.001   < 0.001
  < 164 20,609 3.8   4.5  
 164–171 28,915 3.5   2.6  
  ≥ 172 14,477 2.9   1.7  
 Missing 489 2.9   3.5  
Cohabitation status    0.975   0.105
 Living with partner 58,990 3.5   3.0  
 Not living with partner 4815 3.5   3.6  
 Missing 685 3.5   3.4  
In vitro fertilization    0.003   0.320
 Yes 4437 4.3   3.2  
 No 60,053 3.4   3.0  
Prior miscarriages (number)    0.022   0.022
  ≤ 2 63,822 3.5   3.0  
  ≥ 3 (recurrent) 668 5.1   4.0  
Smokingd    0.088   < 0.001
 Yes 2626 2.7   5.2  
 No 61,330 3.5   2.9  
 Missing 534 3.6   2.6  
Country of birth    < 0.001   < 0.001
 Sweden 41,392 3.7   2.6  
 Other Nordic countries 875 3.9   3.0  
 Outside Nordic region 12,551 2.8   4.3  
 Missing 9672 3.4   3.3  
  1. aBP: Blood pressure. bStage 1 hypertension, in early gestation: Systolic BP 130–139 mmHg or diastolic BP 80–89 mmHg before 16 weeks, cBMI Body mass index, dDaily smoking in early gestation. P-values were calculated with chi-square test