Table 3 Associations of paternal age at pregnancy with adolescent cognitive development and emotional and behavioural problems in a birth cohort in rural Western China. Higher scores indicated better cognitive development and worse emotional and behavioural problems

FSIQ

 n

1892

673

345

478

396

 Mean (SD)

97.4(12.1)

98.2(12.1)

96.9(12.7)

97.3(11.9)

96.6(11.7)

 Adjusted mean differences (95% CI) ^a

-0.24(-0.48, 0.01)

Reference

-1.50(-3.00, 0.01)

-1.31(-3.06, 0.44)

-1.72(-4.24, 0.80)

 P value for linear trend

0.064

0.097

Total behavioural problem score

 n

1892

673

345

478

396

 Mean (SD)

49.5(25.5)

47.8(25.3)

49.3(25.0)

50.8(25.5)

50.9(26.0)

 Adjusted mean differences (95% CI) ^a

0.45(-0.13, 1.03)

Reference

2.64(-0.86, 6.14)

5.07(1.00, 9.14)

6.71(0.86, 12.57)

 P value for linear trend

0.126

0.010

Internalizing behavioural problem score

 n

1892

673

345

478

396

 Mean (SD)

11.3(8.0)

10.8(8.2)

11.1(8.0)

11.5(7.8)

12.1(8.0)

 Adjusted mean differences (95% CI) ^a

0.07(-0.12, 0.25)

Reference

0.50(-0.61, 1.61)

1.11(-0.18, 2.40)

2.05(0.19, 3.91)

 P value for linear trend

0.467

0.035

Externalizing behavioural problem score

 n

1892

673

345

478

396

 Mean (SD)

8.6(7.4)

8.1(7.2)

8.5(7.2)

9.3(7.7)

8.9(7.5)

 Adjusted mean differences (95% CI) ^a

0.09(-0.08, 0.25)

Reference

0.60(-0.42, 1.61)

1.38(0.19, 2.56)

1.09(-0.62, 2.79)

 P value for linear trend

0.317

0.062