Table 1.
Preterm demographics and sleep information
| Variables | All infants | Infants without PB | Infants with PB |
|---|---|---|---|
| Gestational age (weeks) at enrollment | 27 (25–28) | 28 (25–28) | 27 (25–28)* |
| Gender (M:F) | 9:11 | 6:4 | 3:7 |
| Birth weight (grams) | 975.3 ± 233.7 | 1109.5 ± 226.2 | 841.0 ± 155.2* |
| APGAR scores at 1 minute | 5 (1–8) | 5 (1–8) | 5 (1–8) |
| APGAR scores at 5 minutes | 6 (1–9) | 6 (3–9) | 7 (1–9) |
| Post-menstrual age (weeks) at recording | 36 (34–40) | 36 (34–40) | 37 (34–39) |
| Quiet sleep duration (minutes) | 19.3 ± 7.0 | 19.2 ± 5.8 | 19.3 ± 8.4 |
| Total recording duration (minutes) | 53.9 ± 13.6 | 50.7 ± 15.1 | 57.1 ± 11.8 |
| Sigh frequency (sighs/minute of total recording) | 0.7 ± 0.2 | 0.7 ± 0.3 | 0.7 ± 0.2 |
| Number of windows analyzed per infant | 5.6 ± 2.2 | 5.7 ± 1.8 | 5.4 ± 2.7 |
Values are present as mean ± SD or median (range) as appropriate.
*p ≤ 0.05 when comparing infants with and without PB.