. 2021 May 30;6(8):2151–2158. doi: 10.1016/j.ekir.2021.05.032

Table 1.

Characteristics of included subjects and maternal health according to whether the subject or at least 1 sibling had LBW. Norway, 1967 to 2016

Characteristic	Neither individual nor sibling with LBW	Individual without LBW, sibling with LBW	Individual LBW, sibling not LBW	Individual and sibling with LBW
N total	1,483,071	181,507	111,387	71,600
Mean number of siblings	1.6 ± 0.8	1.9 ± 1.0^a	1.5 ± 0.7^a	1.7 ± 0.9^a
Mean number of years of follow-up	28.4 ± 12.4	29.0 ± 12.2^a	29.2 ± 12.6^a	29.2 ± 12.4^a
Proportion with preterm birth	1.5%	2.6%^a	28.0%^a	28.1%^a
Proportion with SGA	3.5%	9.4%^a	60%^a	65%^a
Proportion with maternal preeclampsia	2.1%	2.7%^a	8.5%^a	8.1%^a
Proportion with 5-min Apgar score <7	0.7%	0.6%	2.6%^a	2.4%^a
Proportion with maternal disease^b	2.2%	2.5%^a	2.7%^a	3.4%^a
Form of kidney disease
N with chronic kidney disease	2413	388^a	326^a	209^a
N with acute kidney disease	2499	368^a	275^a	185^a
N with glomerulonephritis	2666	375^c	245^c	177^a
N with hereditary cystic kidney disease	706	109^c	70^c	49^c
N with kidney or urinary tract malformations	2065	23	193^b	152^a

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

P < 0.001.

Maternal disease was defined as maternal diabetes mellitus, kidney disease, rheumatic disease, or essential hypertension diagnosed before pregnancy.

P < 0.01 as compared with the group with neither individual nor sibling with LBW.