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Table 1 Characteristics of RPGEH Prenatal Cohort Participants Compared to Non-Participants in Kaiser Permanente Northern California

From: The Kaiser Permanente Northern California research program on genes, environment, and health (RPGEH) pregnancy cohort: study design, methodology and baseline characteristics

  Overall Denominator (n = 93,409) Participants (n = 16,977) Non-Participants (n = 76,432)
Characteristic N (%)
 Agea
 18–24 14,590 (15.6) 2,456 (15.1) 12,134 (15.9)
 25–29 25,685 (27.5) 4,769 (28.1) 20,916 (27.4)
 30–34 32,469 (34.8) 6,158 (36.3) 26,311 (34.4)
 35–39 16,574 (17.7) 2,940 (17.9) 13,634 (17.8)
 40 or older 4,065 (4.4) 653 (3.8) 3,412 (4.5)
 Unknown 26 (<0.1) 1 (<0.1) 25 (<0.1)
Race/Ethnicity
 Non-Hispanic White 36,704 (39.3) 7,975 (47.0) 28,729 (37.6)
 Hispanic 22,578 (24.2) 3,909 (23.0) 18,669 (24.4)
 Asian 22,413 (24.0) 3,264 (19.2) 19,149 (25.0)
 African American 6,448 (6.9) 960 (5.6) 5,488 (7.2)
 Other 3,965 (4.2) 691 (4.1) 3,274 (4.3)
 Unknown 1,301 (1.4) 178 (1.1) 1,123 (1.5)
Parity
 0 58,395 (62.5) 10,312 (60.7) 48,083 (62.9)
 1 26,210 (28.1) 5,030 (29.6) 21,180 (27.7)
 2+ 8,804 (9.4) 1,635 (9.6) 7,169 (9.4)
Pre-pregnancy BMI (kg/m2)
  < 18.5 1919 (2.4) 276 (1.9) 1,643 (2.5)
 18.5–24.9 36,957 (46.2) 6,607 (44.8) 30,350 (46.5)
 25.0–29.9 20, 758 (25.9) 4,013 (27.2) 16,745 (25.6)
 30.0+ 17,132 (21.4) 3546 (24.0) 13,586 (20.8)
 Unknown 3,320 (4.2) 315 (2.1) 3,005 (4.6)
Gestational age at initiation of prenatal care
 1st trimester 83,551 (89.5) 16,041 (94.5) 67,510 (88.3)
 2nd trimester 6,707 (7.2) 722 (4.3) 5,985 (7.8)
 3rd trimester 2,980 (3.2) 141 (0.8) 2,839 (3.7)
 Unknown 171 (0.2) 73 (0.4) 98 (0.1)
 Length of enrollment before pregnancy (years) 8.9 (8.6) 10.0 (9.1) 8.6 (8.5)
 Length of enrollment after pregnancy (years) 2.5 (1.2) 2.7 (1.3) 2.5 (1.2)
  1. aAge at standard first trimester prenatal panel blood draw