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Table 1 Maternal and infant characteristics (n=1659)

From: The association between interpregnancy interval and birth weight: what is the role of maternal polyunsaturated fatty acid status?

Characteristic  
Infant  
Male (%) 48.1
Birth weight in g (mean ± SD) 3594 ± 505
Gestational age at birth in wk (mean ± SD) 40.0 ± 1,2
Small-for-gestational-age (%) 12.4
Maternal  
Interpregnancy interval (%)  
< 6 mo 3.6
6-11 mo 16.7
12-17 mo 16.8
18-23 mo 13.5
≥ 24 mo 49.4
Age (%)  
< 25 y 5.7
25-34 y 61.2
≥ 35 y 33.1
Parity (%)  
1 74.2
2 18.9
≥3 6.9
Height in cm (mean ± SD) 168.5 ± 7.2
Prepregnancy BMI in kg/m 2 (mean ± SD) 23.4 ± 4.1
Unintended pregnancy (%) 7.2
Non-spontaneous pregnancy (%) 1.9
Time to pregnancy (%)  
<3 mo 64.9
3-12 mo 26.4
≥ 12 mo 8.7
Started prenatal care (%)  
< 18 wk 92.1
18-23 wk 6.0
≥ 24 wk 1.9
Alcohol consumption (%)  
None 41.2
Yes, but not since pregnancy 32.5
Yes, also during pregnancy 26.3
Smoking (%)  
None 81.3
Yes, but not since pregnancy 10.2
Yes, also during pregnancy 8.6
Psychosocial stressors (%)  
0 73.4
1 16.5
≥2 10.1
Cohabitant status (% living alone) 9.2
Education (%)  
<6 y 22.3
6-10 y 38.9
≥ 11 y 38.8
Country of birth (%)  
Netherlands 64.0
Surinam 6.1
Turkey 4.5
Morocco 7.5
Other non-Western country 11.6
Other Western country 6.0
Country of birth of the mother’s mother (%)  
Netherlands 58.4
Surinam 8.4
Turkey 5.1
Morocco 8.3
Other 19.7