Body temperature | Χ2 value | φ | P value | |||||||
Low body temperature (n = 35) | Normal temperature (n = 191) | |||||||||
n | % | Adjusted residual | n | % | Adjusted residual | |||||
Breakfast | ||||||||||
(n = 226) | I eat breakfast every morning. | 28 | 12.39 | −2.4 | 177 | 78.32 | 2.4 | 5.63 | −0.16 | 0.02* |
I sometimes do not eat breakfast. | 7 | 3.10 | 2.4 | 14 | 6.19 | −2.4 | ||||
Bowel movement | ||||||||||
(n = 226) | I have bowel movement every day. | 18 | 7.96 | −1.0 | 116 | 51.33 | 1.0 | 1.06 | −0.07 | 0.30 |
I do not have bowel movement every day. | 17 | 7.52 | 1.0 | 75 | 33.19 | 1.0 | ||||
School meal | ||||||||||
(n = 226) | I always eat a full school meal. | 30 | 13.27 | 3.1 | 111 | 49.12 | −3.1 | 8.46 | 0.21 | 0.00a)*** |
I sometimes leave part of a school meal. | 5 | 2.21 | −3.1 | 80 | 35.40 | 3.1 | ||||
Snack (lunch to dinner) | ||||||||||
(n = 226) | I eat a snack four days or more a week. | 13 | 5.75 | −0.1 | 73 | 32.30 | 0.1 | 0.02 | −0.01 | 0.90 |
I eat a snack less than three days a week. | 22 | 9.73 | 0.1 | 118 | 52.21 | −0.1 | ||||
Snack (dinner to fall asleep) | ||||||||||
(n = 226) | I eat a snack four days or more a week. | 1 | 0.44 | −1.1 | 15 | 6.64 | 1.1 | 0.49 | −0.07 | 0.48a) |
I eat a snack less than three days a week. | 34 | 15.04 | 1.1 | 176 | 77.88 | −1.1 | ||||
Exercise | ||||||||||
(n = 226) | I exercise three or more days a week. | 26 | 11.50 | −0.6 | 150 | 66.37 | 0.6 | 0.31 | −0.04 | 0.58 |
I exercise less than two days a week. | 9 | 3.98 | 0.6 | 41 | 18.14 | −0.6 | ||||
Cram school | ||||||||||
(n = 226) | I am going to cram school. | 16 | 7.08 | −0.2 | 90 | 39.82 | 0.2 | 0.02 | −0.01 | 0.88 |
I am not going to cram school. | 19 | 8.41 | 0.2 | 101 | 44.69 | −0.2 | ||||
PSQI | ||||||||||
(n = 226) | PSQI ≥ 6 | 2 | 0.88 | −0.8 | 6 | 2.65 | 0.8 | 0.07 | −0.05 | 0.36a) |
PSQI < 6 | 33 | 14.60 | 0.8 | 185 | 81.86 | −0.8 | ||||
Physical strength | ||||||||||
(n = 225) | High | 17 | 7.56 | 0.4 | 102 | 45.33 | −0.4 | 0.13 | 0.02 | 0.71 |
Low | 17 | 7.56 | −0.4 | 89 | 39.56 | 0.4 | ||||
Falling asleep# | ||||||||||
(n = 177) | I could fall asleep quickly. | 19 | 10.73 | 0.0 | 134 | 75.71 | 0.0 | 0.00 | 0.00 | 1.00a) |
I had difficulty sleeping. | 3 | 1.69 | 0.0 | 21 | 11.86 | 0.0 | ||||
Wake up## | ||||||||||
(n = 105) | I woke up feeling refreshed. | 12 | 11.43 | 0.3 | 69 | 65.71 | −0.3 | 0.00 | 0.03 | 1.00a) |
I was sleepy. | 3 | 2.86 | −0.3 | 21 | 20.00 | 0.3 |