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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.