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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