Table 1.
Selected characteristics in relation to group (symptom-free (SF), nausea only (NP), and nausea and vomiting (NVP)), including total sample used and those excludeda
| SF | NP | NVP | Total sample | Excludedb | |
|---|---|---|---|---|---|
| (n = 14 234) | (n = 20 371) | (n = 17 070) | (n = 51 675) | (n = 41 195) | |
| Maternal age at delivery (y), n = 51 675 | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) |
| 30.3 (4.5) | 30.8 (4.4) | 29.2 (4.6) | 30.1 (4.6) (missing = 0 %) | 29.8 (4.8) (missing = 1 %) | |
| BMI at pregnancy start (kg/m2), n = 51 675 | 23.9 (4.1) | 23.9 (4.1) | 24.3 (4.6) | 24.0 (4.3) (missing = 0 %) | 24.4 (4.4) (missing = 16.9 %) |
| Energy intake (kJ), n = 51 675 | 9539 (2527.8) | 9706.2 (2489.0) | 9830.7 (2722.1) | 9701.5 (2581.2) (missing = 0 %) | 9644.5 (4170.1) (missing = 20.8 %) |
| n (%) | n (%) | n (%) | n (%) | n (%) | |
| Parity, n = 51 648 Para 0 | 8947 (62.9) | 9475 (46.5) | 9070 (53.2) | 27 492 (49.8) (missing = 0.1 %) | 20 513 (53.2) (missing = 0.7 %) |
| Maternal education (y), n = 51 675 ≤ 12 y | 4200 (30.2) | 5535 (27.7) | 5755 (34.5) | 15 490 (30.0) (missing = 2.1 %) | 13 402 (32.5) (missing = 13.2 %) |
| Smoking during pregnancy, n = 51 329 Daily | 946 (6.7) | 805 (4.0) | 803 (4.7) | 2554 (4.9) (missing = 0.7 %) | 2629 (6.4) (missing = 14.4 %) |
aExcerpt of sample characteristics from Chortatos et al. [10]
bTotal MoBa sample n = 108 842 children, minus 1906 2nd or 3rd order children from multiple pregnancies = 106 936 women. Minus 51 675 women included in sample = 55 261. Excluding 14 066 women with ≥1 participation in MoBa gives 41 195 unique cases