Table 4 Multivariate logistic regression for usual bedtime and 2-year myopia incidence.
From: Sleeping late is a risk factor for myopia development amongst school-aged children in China
Variable | Adjusted OR (95% CI) | Test statistic, p |
|---|---|---|
Area: Sub-urban | 1 (Reference) | |
Urban | 1.25 (1.06, 1.48) | z = 2.64, p = 0.008 |
Age (years): 6 years | 1 (Reference) | |
7 years | 1.33 (1.14, 1.55) | z = 3.59, p < 0.001 |
8 years | 1.40 (1.15, 1.70) | z = 3.4, p = 0.001 |
Gender: Male | 1 (Reference) | |
Female | 1.23 (1.08, 1.41) | z = 3.07, p = 0.002 |
Usual bedtime: before 9 p.m. | 1 (Reference) | |
9 p.m. to 9:29 p.m. | 1.21 (0.91, 1.61) | z = 1.29, p = 0.20 |
9:30 p.m. and after | 1.45 (1.05, 2.00) | z = 2.27, p = 0.02 |
Sleep duration (h): < 9.5 h | 1 (Reference) | |
9.5 to 10 h | 1.02 (0.88, 1.20) | z = 0.3, p = 0.76 |
10 h and more | 1.04 (0.82, 1.32) | z = 0.32, p = 0.75 |
Outdoor weekly total (per h) | 0.97 (0.95, 0.99) | z = − 3.66, p < 0.001 |
