Table 1 Maternal and offspring characteristics of the full Omega cohort and participants included in the current pre-pregnancy and early pregnancy analyses
|  | Full Omega cohort (n = 4128) | Pre-pregnancy analysis (n = 1373) | Early pregnancy analysis (n = 1535) |
|---|---|---|---|
Maternal characteristics | |||
 Age (years), mean (SD) | 33 (5) | 33 (4) | 33 (4) |
 Non-Hispanic white race, n (%) | 3504 (85) | 1196 (87) | 1329 (87) |
 High school education or more, n (%) | 3733 (96) | 1337 (97) | 1496 (97) |
 Married, n (%) | 3746 (91) | 1263 (92) | 1417 (92) |
 Nulliparous, n (%) | 2510 (61) | 803 (58) | 894 (58) |
 Pre-pregnancy BMI, n (%) | |||
  Underweight (< 18.5 kg/m2) | 76 (2) | 28 (2) | 31 (2) |
  Normal weight (18.5–24.9 kg/m2) | 2961 (72) | 997 (73) | 1121 (73) |
  Overweight (25–29.9 kg/m2) | 700 (17) | 250 (18) | 273 (18) |
  Obese (≥30 kg/m2) | 391 (9) | 98 (7) | 110 (7) |
 Total gestational weight gain (kg), mean (SD) | 14 (5) | 14 (4) | 14 (5) |
Maternal behaviors | |||
 Smoking during pregnancy, n (%) | 225 (6) | 71 (5) | 80 (5) |
 Alcohol use during pregnancy, n (%) | 375 (9) | 167 (12) | 172 (11) |
 Pre-pregnancy sedentary time (hours per day), mean (SD) | 2.3 (1.4) | 2.3 (1.3) | 2.3 (1.3) |
 Early pregnancy sedentary time (hours per day), mean (SD) | 2.6 (1.6) | 2.7 (1.6) | 2.6 (1.5) |
 Pre-pregnancy moderate/vigorous leisure time physical activity (hours per week), median (IQR) | 4.3 (5.4) | 4.5 (4.7) | 4.4 (4.6) |
 Early pregnancy moderate/vigorous leisure time physical activity (hours per week), median (IQR) | 3.0 (5.7) | 2.3 (3.6) | 2.3 (3.8) |
Offspring characteristics | |||
 Birthweight (grams), mean (SD) | 3449 (555) | 3447 (524) | 3440 (534) |
 Gestational age at delivery (weeks), mean (SD) | 39 (2) | 39 (2) | 39 (2) |
 Male, n (%) | 2110 (51) | 738 (54) | 830 (54) |