Table.

Relative risk (95% confidence interval) for development of diabetes assuming linear trend across categories

	Univariate analysis	P value*	Multivariate analysis†	P value*
Maternal age (years) v <20
20-24	1.25 (1.19 to 1.32)	<0.0001	1.25 (1.17 to 1.34)	<0.0001
25-29	1.57 (1.39 to 1.77)		1.57 (1.33 to 1.85)
30-34	1.97 (1.65 to 2.35)		1.98 (1.55 to 2.52)
35-39	2.47 (1.95 to 3.13)		2.48 (1.79 to 3.43)
⩾40	3.10 (2.31 to 4.16)		3.11 (2.07 to 4.66)
Paternal age (years) v <20
20-24	1.18 (1.12 to 1.24)	<0.0001	1.09 (1.03 to 1.16)	0.003
25-29	1.39 (1.24 to 1.54)		1.20 (1.05 to 1.37)
30-34	1.63 (1.39 to 1.92)		1.31 (1.08 to 1.59)
35-39	1.92 (1.55 to 2.38)		1.43 (1.10 to 1.86)
40-45	2.27 (1.74 to 2.95)		1.57 (1.13 to 2.17)
Birth order v 1st born
2nd	0.97 (0.92 to 1.03)	0.37	0.85 (0.79 to 0.90)	<0.0001
3rd	0.95 (0.85 to 1.06)		0.72 (0.64 to 0.80)
4th	0.93 (0.78 to 1.09)		0.61 (0.52 to 0.71)
⩾5th	0.90 (0.72 to 1.13)		0.52 (0.42 to 0.63)
Male v female	1.20 (1.08 to 1.33)	0.0007	1.21 (1.08 to 1.35)	<0.0001

^*Significance of overall effect of variable in model. 

^†Relative risk adjusted for three other factors in model.