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Table 1 Demographic characteristics of study participants by case status

From: Prenatal exposure to consumer product chemical mixtures and size for gestational age at delivery

  Median (25th, 75th percentile) or n (%)
SGA
(n = 31)
AGA
(n = 31)
LGA
(n = 28)
Matched Variables
 Maternal Age (years) 33.6 (26.9, 37.3) 32.4 (30.4, 37.5) 34.5 (30.4, 37.1)
 Pre-pregnancy BMI (kg/m2) 23.0 (20.2, 27.9) 23.0 (22.3, 27.4) 25.7 (22.1, 27.9)
Race/Ethnicity
 White 19 (61) 18 (58) 17 (61)
 Black 6 (19) 6 (19) 6 (21)
 Other1 6 (19) 7 (23) 5 (18)
 Gestational Age (weeks) 37.9 (37.1, 38.6) 39.0 (38.3, 39.6) 39.1 (38.8, 39.8)
Non-matched Variables
 Birth weight (kg) 2.3 (2.2, 2.4) 3.2 (3.0, 3.4) 4.2 (4.1, 4.3)
 Birth weight percentile (%) 3.0 (1.0, 4.0) 35.0 (23.0, 46.0) 96.0 (93.0, 97.5)
Maternal Insurance
 Private 22 (71) 24 (77) 20 (71)
 Public 9 (29) 7 (23) 8 (29)
Maternal Education
  ≤ High School 3 (10) 3 (10) 1 (4)
 Some college or technical school 8 (26) 8 (26) 6 (21)
  ≥ College graduate 20 (65) 20 (65) 21 (75)
Parity
 Nulliparous 7 (23) 10 (32) 7 (25)
 Parous 24 (77) 21 (68) 21 (75)
Smoking During Pregnancy
 No 27 (87) 29 (94) 28 (100)
 Yes 4 (13) 2 (6) 0 (0)
Alcohol Use During Pregnancy
 No 29 (94) 28 (90) 27 (96)
 Yes 2 (6) 3 (10) 1 (4)
Fetal Sex
 Female 19 (61) 18 (58) 13 (46)
 Male 12 (39) 13 (42) 15 (54)
  1. Abbreviations: IQR = interquartile range; BMI = body mass index
  2. 1The “Other” race/ethnicity category is a condensation of larger categories with insufficient sample size for disaggregation (e.g., Hispanic/Latino ethnicity, South Asian, East Asian, Native American, multiracial)