Table 1.
Sample demographics and characteristics (n = 91)
| All subjects | Sleep Education | CBTI | ||
|---|---|---|---|---|
| Sample size | 91 | 45 | 46 | |
| Age (M±SD) | 29.03 ± 4.16y | 29.16 ± 4.11 | 28.91 ± 28.91 | t(89) = −0.28, p = 0.78 |
| Poverty (n; %) | 16/90; 17.8% | 9/44; 20.5% | 7/46; 15.2% | χ2 = 0.42, p = 0.52 |
| Obesity (BMI ≥ 35) (n; %) | 12/86; 14.0% | 3/42; 7.1% | 9/44; 20.5% | χ2 = 3.17, p = 0.08 |
| Multiparous (n; %) | 59/91; 64.8% | 15/45; 33.3% | 17/46; 37.0% | χ2 = 0.13, p = 0.72 |
| Snore (n; %) | 28/91; 30.8% | 9/45; 20.0% | 19/46; 41.3% | χ2 = 4.85, p = 0.03 |
| Gestational onset of insomnia (n; %) | 20/91; 22.0% | 11/45; 24.4% | 9/46; 19.6% | χ2 = 0.32, p = 0.57 |
| Race (n; %) | χ2 = 0.38, p = 1.00 | |||
| White | 47; 51.6% | 23; 51.1% | 24; 52.2% | |
| Black | 29; 31.9% | 14; 31.1% | 15; 32.6% | |
| Asian | 6; 6.6% | 3; 6.7% | 3; 6.5% | |
| Middle Eastern or Arabic | 4; 4.4% | 2; 4.4% | 2; 4.3% | |
| Hispanic or Latino | 2; 2.2% | 1; 2.2% | 1; 2.2% | |
| Multiracial | 3; 3.3% | 2; 4.4% | 2.2% | |
| Number of sessions completed (M±SD) | 5.14 ± 1.75 | 5.47 ± 1.58 | 4.83 ± 1.88 | t(89) = −1.76, p = 0.08 |
Note: Age = age (in years) at study screening. BMI = body mass index derived from electronic medical records. Obesity was operationalized as BMI ≥35 as this cutoff is a robust and sensitive predictor of sleep-disordered breathing in pregnant women. M±SD = mean and standard deviation. n; % = number of participants and percentage within that group. t = t-statistic from independent samples t-test comparing means between sleep education and CBTI conditions. χ2 = chi-square value derived from comparing treatment conditions on binary variables. p = significant value. Age, income, parity, insomnia onset, and race were all reported by patients. Poverty was operationalized as <$20,000 annual household income