Table 2.

RR for ESRD according to birth-related variables, unadjusted and adjusted models: Childbirths 1967 to 2004, ESRD 1980 to 2005, Norway

Parameter	Unadjusted									Adjusteda
	All			Men			Women			Men		Women
	n	RRb	P	n	RR	P	n	RR	P	RR	P	RR	P
Birth weight
<10th percentile	81	1.7 (1.4 to 2.2)	<0.001	46	1.7 (1.2 to 2.3)	0.001	35	1.9 (1.3 to 2.7)	<0.001	1.8 (1.3 to 2.4)	<0.001	1.8 (1.2 to 2.7)	0.002
10 to 90th percentile	402	1.0		242	1.0		160	1.0
≥90th percentile	39	0.86 (0.62 to 1.2)	0.4	22	0.81 (0.52 to 1.3)	0.3	17	0.95 (0.58 to 1.6)	0.9	0.79 (0.51 to 1.2)	0.3	0.96 (0.58 to 1.6)	0.9
Birth weight for gestational age
<10th percentile	81	1.5 (1.2 to 1.9)	0.002	50	1.6 (1.1 to 2.1)	0.005	31	1.4 (0.92 to 2.0)	0.1	1.6 (1.1 to 2.1)	0.006	1.3 (0.89 to 1.9)	0.2
10 to 90th percentile	369	1.0		216	1.0		152	1.0		1.0		1.0
≥90th percentile	38	0.94 (0.67 to 1.3)	0.7	21	0.88 (0.56 to 1.4)	0.6	17	1.0 (0.62 to 1.7)	0.9	0.87 (0.55 to 1.4)	0.5	1.0 (0.62 to 1.7)	0.9

^aAdjusted for birth year, maternal preeclampsia, any congenital malformation, multiple delivery, maternal age at birth, maternal marital status and birth order.

^bAdjusted for gender.