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Table 1 Descriptive characteristics of possible confounding factors

From: An association of adult personality with prenatal and early postnatal growth: the EPQ lie-scale

Exposure variablesa Mean level of birthweight
Men (P-valueb) Women (P-valueb)
Single mother   
Yes 3213 g (0.14) 3191 g (0.90)
No 3312 g 3183 g
Parity (first parity)   
Yes 3220 g (0.004) 3166 g (0.58)
No 3353 g 3190 g
Mother’s age   
< 24.5 3261 g (0.30) 3179 g (0.99)
≥24.5 3314 g 3178 g
Father’s age   
<28.5 3273 g (0.47) 3159 g (0.47)
≥28.5 3308 g 3193 g
Parental social status   
Lower end (<4) 3275 g (0.68) 3127 g (0.12)
Higher end (≥4) 3297 g 3204 g
Age of EPQ measurement   
≤29 years 3320 g (0.22) 3176 g (0.67)
>29 years 3261 g 3195 g
Adult intelligence   
< 103 3257 g (0.22) 3133 g (0.05)
≥ 103 3315 g 3222 g
Adult weight   
≤ 68.5 3074 g (<0.0001) 3146 g (0.001)
>68.5 3356 g 3318 g
Adult height   
≤ 173 2995 g (<0.0001) 3156 g (0.001)
>173 3342 g 3374 g
Adult head-circumference   
≤ 56.5 3116 g (<0.0001) 3153 g (0.001)
>56.5 3337 g 3357 g
Birth-length   
< 51 cm 2761 g (<0.0001) 2790 g (<0.0001)
≥51 cm 3553 g 3496 g
Head circumference, birth   
< 34.5 cm 2835 g (<0.0001) 2948 g (<0.0001)
≥34.5 cm 3551 g 3526 g
  1. aExposure variables are divided according to 50% distribution.
  2. bTwo independent samples t-test.