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Table 3 The prevalence of sleep insufficient in school closure and after reopening

From: The effect of COVID-19 school closures on adolescent sleep duration: an uncontrolled before-after study

 

Boys

% (95% CI)

Girls

% (95% CI)

Total

% (95% CI)

Grade 6

 School lockdown

18.77(14.42,23.12)

28.36(22.96,33.75)

23.22(19.78,26.67)

 School reopen

58.58(53.08,64.07)

71.64(66.25,77.04)

64.64(60.74,68.55)

 Ratio

3.12(2.49,3.90) ***

2.53(2.11,3.03) ***

2.78(2.41,3.21) ***

Grade 7

 School lockdown

21.48(16.45,26.52)

28.14(22.70,33.57)

24.86(21.14,28.57)

 School reopen

61.72(55.76,67.67)

76.43(71.30,81.56)

69.17(65.20,73.14)

 Ratio

2.87(2.29,3.61) ***

2.72(2.25,3.27) ***

2.78(2.41,3.22) ***

Grade 8

 School lockdown

18.75(13.97,23.53)

15.71(10.79,20.64)

17.38(13.94,20.82)

 School reopen

50.39(44.27,56.52)

63.33(56.82,69.85)

56.22(51.72,60.73)

 Ratio

2.69(2.11,3.43) ***

4.03(2.99,5.43) ***

3.23(2.68,3.91) ***

Grade 9

 School lockdown

12.35(07.41,17.30)

15.34(10.21,20.48)

13.93(10.35,17.51)

 School reopen

48.24(40.74,55.75)

56.61(49.55,63.68)

52.65(47.48,57.81)

 Ratio

3.90(2.61,5.85) ***

3.69(2.67,5.09) ***

3.78(2.94,4.87) ***

Grade 10

 School lockdown

22.29(17.93,26.65) ***

21.22(16.68,25.77) ***

21.79(18.64,24.93)

 School reopen

68.00(63.11,72.89)

76.21(71.47,80.94)

71.86(68.43,75.29)

 Ratio

3.05(2.51,3.72) ***

3.59(2.912,4.43) ***

3.30(2.86,3.81) ***

Grade 11

 School lockdown

23.53(18.78,28.28)

24.22(18.97,29.47)

23.84(20.32,27.37)

 School reopen

57.52(51.98,63.05)

73.05(67.61,78.48)

64.59(60.64,68.54)

 Ratio

2.44(2.02,2.96) ***

3.02(2.45,3.72) ***

2.71(2.35,3.12) ***

Grade 12

 School lockdown

13.73(4.28,23.17)

14.29(6.09,22.48)

14.05(7.86,20.24)

 School reopen

47.06(33.36,60.76)

62.86(51.54,74.18)

56.20(47.36,65.04)

 Ratio

3.43(1.71,6.86) ***

4.40(2.55,7.59)

4.00(2.61,6.13) ***

All Grades

 School lockdown

19.96(55.83,60.53)

22.34(20.27,24.40)

21.10(19.74,22.54)

 School reopen

58.19(55.84,60.53)

70.26(68.00,72.52)

63.98(62.32,65.61)

 Ratio

2.91(2.66,3.20) ***

3.15(2.88,3.44) ***

3.03 (2.84,3.23) ***

  1. Note: ***P < 0.001