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Table 2 Comparison of body weight and sleep problems during the second and the third trimester of pregnancy

From: Characteristics of sleep/wake problems and delivery outcomes among pregnant Japanese women without gestational complications

 

Second trimester

Third trimester

P valuef

Body mass index kg/m2, median (IQR)

22.6 (21.3–24.3)

24.2 (22.5–26.3)

<  0.001

Weight gaina kg, median (IQR)

6.4 (4.8–8.1)

10.2 (8.5–13.3)

<  0.001

Rate of weight gain* %, median (IQR)

11.5 (7.7–13.9)

19.0 (14.9–22.6)

<  0.001

PSQI

 C1:sleep quality ≥2, n (%)

25 (28.4)

51 (58.0)

<  0.001

 C2:sleep latency ≥2b, n (%)

26 (29.5)

43 (48.9)

0.003

 C3:sleep duration ≥2c, n (%)

23 (26.1)

30 (34.1)

<  0.001

 C4:sleep efficiency ≥2d, n (%)

5 (5.7)

12 (13.6)

0.10

 C5:sleep disturbance ≥2, n (%)

23 (26.1)

49 (55.7)

<  0.001

 C6:hypnotic use ≥2e, n (%)

0 (0.0)

1 (1.1)

<  0.001

 C7:daytime dysfunction ≥2, n (%)

8 (9.1)

8 (9.1)

0.64

 Global score ≥ 6, n (%)

30 (34.1)

55 (62.5)

<  0.001

ISI

 Mild to severe DIS, n (%)

36 (40.9)

71 (80.7)

<  0.001

 Moderate to severe DIS, n (%)

16 (18.2)

37 (42.0)

<  0.001

 Mild to severe DMS, n (%)

52 (59.1)

67 (76.1)

0.007

 Moderate to severe DMS, n (%)

23 (26.1)

40 (45.5)

0.005

  Mild to severe DIMS, n (%)

57 (64.8)

80 (90.9)

<  0.001

  Moderate to severe DIMS, n (%)

28 (31.8)

49 (55.7)

<  0.001

 Global score ≥ 10, n (%)

18 (20.5)

37 (42.0)

< 0.001

ESS ≥ 10, n (%)

46 (52.3)

47 (53.4)

1

ESS ≥ 11, n (%)

39 (44.3)

43 (48.9)

0.48

RLS/WED, n (%)

2 (2.3)

8 (9.1)

0.04

3% ODI ≥ 5/h, n (%)

16 (18.2)

26 (29.5)

0.08

 5 ≤ 3% ODI < 15/h, n (%)

16 (18.2)

25 (28.4)

 

 3% ODI ≥ 15/h, n (%)

0 (0.0)

1 (1.1)

  1. DIS Difficulty initiating sleep, DISM Difficulty initiating and/or maintaining sleep, DMS Difficulty maintaining sleep, ESS Epworth Sleepiness Scale, ISI Insomnia Severity Index, IQR Interquartile range, ODI Oxygen desaturation index, PSQI Pittsburgh Sleep Quality Index global score, RLS/WED Restless legs syndrome/Willis–Ekbom disease
  2. aFrom pre-pregnancy
  3. bSleep latency ≥31 min and the presence of difficulty initiating sleep
  4. cTotal sleep duration ≤6 h
  5. dSleep Efficiency < 85%
  6. eMore than one time
  7. fBased on Wilcoxon signed-rank test for continuous variables or McNemar’s test for categorical data