Table 1.

Characteristics of participants in the Norwegian Patient Registry

Characteristic	Total	Diagnostic Groups					Any Kidney Disease
		CKD	Acute Kidney Disease	Glomerular Disease	Cystic Kidney Disease	Congenital Malformations
N	2,663,010	4495	4659	4672	1479	5085	17,313
Male	51%	61%a	62%a	53%	49%	57%a	57%a
Birth yr	1991±14	1979±11a	1980±11a	1987±14a	1991±16	2003±11a	1989±15a
Duration follow-up,b yr	26±14	33±11	33±12	25±14	21±16	9±11	23±16
Maternal marital status single	10%	12%a	13%a	11%c	10%	8%a	11%a
LBW (below tenth percentile)	10%	16%a	15%a	13%a	15%a	13%a	14%a
SGA (below tenth percentile)	10%	17%a	15%a	12%a	14%a	11%	13%a
Preterm birth (<37 wk)	5%	7%a	6%a	5%c	8%a	7%a	6%a
Birth weight <2.5 kg	3%	6%a	5%a	5%a	5%a	5%a	5%a
One risk factord	7%	10%a	9%a	8%c	9%a	7%	8%a
Two risk factorsd	8%	13%a	12%a	10%a	11%a	11%a	11%a
Three risk factorsd	0.6%	1.5%a	0.9%a	1.0%a	1.5%a	1.3%a	1.1%a
Congenital malformations	3.0%	6.6%a	4.6%a	3.9%a	25%a	29.4%a	12.6%a
Apgar 5 min<7	0.96%	2.5%a	3.0%a	0.96%	2.6%a	1.9a	2.0%a
Maternal disease before pregnancye	2.4%	3.3%a	2.8%	3.1%f	7.8%a	4.2%a	3.6%a
Maternal preeclampsia	2.9%	3.2%a	2.6%	2.9%	4.5%a	3.0%	3.1%a

LBW, low birth weight; SGA, small for gestational age.

^aP<0.001 as compared with total.

^bDuration of follow-up until diagnosis or end of 2016.

^cP<0.05.

^dLBW, SGA, or preterm birth.

^eMaternal diagnosis of diabetes mellitus, CKD, rheumatic disease, or essential hypertension before pregnancy.

^fP<0.01.