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Table 4 Descriptive variables for subjective and objective sleep at baseline (2 months postpartum) for Groups A and B

From: Sleep patterns and psychosocial health of parents of preterm and full-born infants: a prospective, comparative, longitudinal feasibility study

  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)
  1. a including non-birth-giving mothers