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Table 2 Incidence of sleep-related problems by bedtime

From: Association between delayed bedtime and sleep-related problems among community-dwelling 2-year-old children in Japan

  Whole Up to 2100hG 2100hG 2130hG 2200h or later G χ 2 p
  n (%) n (%) n (%) n (%) n (%)
Struggles at bedtime 145 (34.1) 25 (20.7) 48 (35.0) 25 (32.5) 47 (52.2) 23.017 <0.001
Wakes up in negative mood 111 (26.1) 24 (19.8) 31 (22.6) 24 (31.2) 32 (35.6) 8.513 0.037
Hard time getting out of bed 47 (11.1) 4 (3.3) 11 (8.0) 12 (15.6) 20 (22.2) 21.680 <0.001
Takes long time to be alert 52 (12.2) 6 (5.0) 15 (10.9) 14 (18.2) 17 (18.9) 12.424 <0.001
Has poor appetite in the morning 76 (17.9) 11 (9.1) 18 (13.1) 21 (27.3) 26 (28.9) 20.516 <0.001
Seems very sleepy 89 (20.9) 26 (21.5) 32 (23.4) 12 (15.6) 19 (21.1) 1.841 0.606