| Group A. Preterm group Median (min–max) | Group B. Full-born group Median (min–max) | ||
---|---|---|---|---|
 | Mothers | Fathersa | Mothers | Fathersa |
Sleep diary | Responders n = 18 | Responders n = 18 | Responders n = 51 | Responders n = 51 |
Daytime function (1, very good; 5, very poor) | 2.5 (1.6–3.1) | 2.4 (1.4–3.1) | 2.1 (1.0–3.9) | 2.3 (1.0–3.3) |
Sleep quality (1, very restless; 5, very sound) | 3.4 (1.6–4.8) | 3.4 (2.0–4.7) | 3.0 (1.5–4.6) | 3.4 (1.6–4.3) |
Number of daytime naps | 0.4 (0–0.9) | 0.2 (0–0.9) | 0.1 (0–1.1) | 0.0 (0–0.7) |
Daytime nap duration (min) | 24.0 (0–62.0) | 7.9 (0–70.0) | 4.3 (0–60) | 0.0 (0–49.0) |
Sleep onset latency (min) | 10.8 (1–82.0) | 12.3 (0–70.0) | 31.4 (1–89.0) | 13.5 (0–98.0) |
Number of nighttime awakenings | 2.4 (1.3–4.9) | 1.8 (0.6–3.7) | 2.7 (0.6–5.0) | 1.4 (0–4.7) |
Wake after sleep onset (min) | 114.3 (12.4–253.8) | 29.9 (3–96.0) | 71.4 (8.6–155.0) | 13.6 (0–74.3) |
Early morning awakening (min) | 13.1 (5.7–43.3) | 9.6 (0–85.0) | 15.7 (0.7–72.9) | 13.3 (0–51.9) |
Total wake time (min) | 147.4 (40.0–247.5) | 68.6 (30.0–132.7) | 125.0 (29.7–237.1) | 45.0 (1.6–131.0) |
Time in bed (min) | 538.2 (421.4–707.9) | 475.0 (373.0–621.4) | 569.3 (415.4–743.6) | 475.7 (346.3–647.1) |
Total sleep time (min) | 415.1 (301.3–516.4) | 411.9 (309.3–507.1) | 427.0 (302.9–582.9) | 425.7 (274.4–567.0) |
Sleep efficiency (%) | 72.6 (52.3–91.2) | 85.2 (73.9–93.8) | 78.1(59.6–93.4) | 90.6 (71.8–99.6) |
Actigraph | Responders n = 18 | Responders n = 18 | Responders n = 53 | Responders n = 53 |
Time in bed (min) | 528.8 (431.2–695.4) | 466.0 (336.6–625.6) | 538.0 (395.0–702.6) | 462.0 (356.6–560.0) |
Total sleep time (min) | 421.0 (343.4–500.8) | 387.4 (292.1–500.9) | 433.0 (328.0–561.8) | 397.7 (315.1–468.9) |
Sleep onset latency (min) | 13.1 (2.4–30.6) | 15.3 (1.6–59.1) | 13.0 (1.0–65.4) | 13.0 (2.9–48.2) |
Sleep efficiency (%) | 78.3 (65.8–87.9) | 85.8 (64.7–91.0) | 81.5 (66.7–90.1) | 85.3 (77.1–91.2) |
Wake after sleep onset (min) | 100.0 (31–192.2) | 37.6 (26.1–88.4) | 61.7 (31.5–143.0) | 34.0 (14.4–73.0) |