Demographic and baseline clinical characteristics of the pregnancy cohort according to the AHI stratum
| Complete cohort (n=234) | AHI<5 (n=77) | 5≤AHI <10 (n=84) | 10≤AHI<15 (n=33) | AHI≥15 (n=36) | |
|---|---|---|---|---|---|
| Age, years | 31.0 (4.3) | 29.6 (4.1) | 31.3 (4.4) | 32.1 (4.5) | 32.7 (3.7) |
| Caucasian ethnicity | 190 (82%) | 64 (83%) | 72 (86%) | 24 (75%) | 27 (75%) |
| Number of years in school | 18.0 (9.3) | 18.4 (12.1) | 17.6 (3.0) | 17.0 (4.1) | 18.9 (14.2) |
| Nulliparous | 99 (42%) | 38 (49%) | 33 (39%) | 13 (41%) | 14 (39%) |
| BMI prepregnancy (kg/m2) | 22.8 (3.8) | 22.0 (3.3) | 22.4 (3.6) | 23.0 (3.5) | 25.2 (4.6) |
| BMI ≥30 kg/m2 | 16 (7%) | 2 (3%) | 6 (7%) | 2 (7%) | 6 (17%) |
| Neck circumference (cm) | 33.3 (2.0) | 33.0 (1.8) | 33.0 (1.9) | 33.7 (2.3) | 34.6 (1.6) |
| Smoking during pregnancy | 15 (6%) | 4 (5%) | 6 (7%) | 3 (9%) | 2 (6%) |
Values are means (SD) or numbers (%).
p Values represent statistical tests by analysis of variance (ANOVA) for continuous variables and Fisher's exact test for non-parametrical and χ2 test for parametrical categorical variables. The neck circumference was taken at the time of the third trimester polysomnogram. Smoking during pregnancy was defined as smoking at least five cigarettes/day.
AHI, apnoea-hypopnoea index; BMI, body mass index.