Table 2.

Main pregnancy outcomes between stone formers and nonstone formers

Characteristic	Stone Formers, n=166	Nonstone Formers, n=1264	P Value
Maternal outcomes
Metabolic complications of pregnancy
Average GLT glucose, mg/dl	111±18	107±18	0.04
Gestational diabetes, n (%)	28 (18)	65 (6)	<0.001
Gestational weight gain, kg	11.9±6.0	12.9±5.2	0.03
Hypertensive complications of pregnancy
Maximum systolic BP, mm Hg	126±14	121±10	<0.001
Maximum diastolic BP, mm Hg	78±9	77±8	0.15
Gestational hypertension, n (%)	37 (22)	162 (13)	0.001
Preeclampsia, n (%)	25 (16)	70 (8)	0.002
Cesarean section, n (%)
All	49 (30)	408 (32)	0.50
Elective	13 (27)	192 (48)	0.01
Neonatal outcomes
Gestational age at delivery, wk
Preterm delivery, wk, n (%)	38.7±2.0	39.2±1.7	0.01
<37	27 (16)	96 (8)	<0.001
<34	4 (3)	16 (1)	0.24
Baby weight, g	3286±634	3415±541	0.01
Small for gestational age, n (%)	13 (8)	86 (7)	0.33
Large for gestational age, n (%)	15 (9)	122 (10)	0.80
Neonatal ICU admission, n (%)	16 (10)	77 (6)	0.08
Composite fetal outcome, n (%)	35 (21)	191 (15)	0.05

Data are presented as n (%) or mean±SD. Average GLT glucose results are only presented for women who had normal testing on GLT (<140 mg/dl; n=876). Maximum systolic and diastolic BPs were recorded in the third trimester. Small for gestation age is defined as <10 percentile birthweight adjusted for gestational age at delivery. Large for gestational age is defined as >90 percentile birthweight adjusted for gestational age at delivery. GLT, glucose loading test; ICU, intensive care unit.