Correlation of Myopia with Physical Exercise and Sleep Habits among Suburban Adolescents
Table 2
Demographic characteristics of the study population and the factors of adjusted myopia and control groups during the semester and holidays after adjustment.
Control
Adjusted myopia
χ2
(chi-square test)
(logistic regression analysis)
OR
95% CI
(N = 521)
(N = 521)
Lower
Upper
Gender, male, N (%)
317 (60.84)
317 (60.84)
0.000
1.000
0.506
1.098
0.834
1.444
Parental myopia
Father, N (%)
104 (19.96)
104 (19.96)
0.000
1.000
0.920
1.017
0.737
1.402
Mother, N (%)
118 (22.65)
118 (22.65)
0.000
1.000
0.686
0.939
0.692
1.274
Age (mean ± SD years)
14.67 ± 1.66
14.84 ± 1.35
0.000
1.000
Junior group (11–14 years), N (%)
163 (31.29)
163 (31.29)
Senior group (15–18 years), N (%)
358 (68.71)
358 (68.71)
0.621
0.927
0.688
1.251
During the semester
Average number of days per week participating in outdoor activities, N (%)
3.230
0.072
≤2 days
241 (46.26)
270(51.82)
3–7 days
280 (53.74)
251 (48.18)
0.017
0.698
0.519
0.939
Average number of hours spent on each outdoor activity session, N (%)
5.507
0.064
<Half an hour
140 (26.87)
128 (24.57)
0.220
≥Half an hour and < one hour
217 (43.25)
254 (48.75)
0.224
1.239
0.877
1.751
≥One hour
164 (31.48)
139 (26.68)
0.892
0.972
0.650
1.455
Average number of hours per week of outdoor activities, N (%)
0.467
0.494
<3 hours
285 (54.70)
274 (52.59)
≥3 hours
236 (45.30)
247 (47.41)
0.073
1.338
0.973
1.841
Average number of hours per week of indoor activities, N (%)
0.601
0.438
<3 hours
412 (79.08)
422 (81.00)
≥3 hours
109 (20.92)
99 (19.00)
0.530
0.887
0.611
1.289
Mid-day nap, N (%)
0.628
0.428
Yes
133 (25.53)
122 (23.42)
0.457
0.890
0.654
1.210
No
388 (74.47)
399 (76.58)
Average number of hours per night of sleep, N (%)
5.312
0.070
<6 hours
95 (18.24)
78 (14.97)
0.242
≥6 hours and <8 hours
331 (63.53)
366 (70.25)
0.114
1.370
0.927
2.026
≥8 hours
95 (18.23)
77 (14.78)
0.524
1.183
0.705
1.984
Average night bedtime, N (%)
1.587
0.452
Before 10 pm (excluding 10 pm)
191 (36.66)
177 (33.97)
0.799
10 pm-11 pm (excluding 11 pm)
213 (40.88)
233 (44.72)
0.532
0.901
0.650
1.249
After 11 pm (including 11 pm)
117 (22.46)
111 (21.31)
0.896
0.972
0.634
1.490
Average daily wake time, N (%)
4.789
0.029
Before 6 am (excluding 6 am)
208 (39.92)
243 (46.64)
After 6 am (including 6 am)
313 (60.08)
278 (53.36)
0.047
0.761
0.581
0.997
During holidays
Average number of days per week participating in outdoor activities, N (%)
0.346
0.556
≤2 days
348 (66.79)
339 (65.07)
3–7 days
173 (33.21)
182 (34.93)
0.254
1.189
0.883
1.600
Average number of hours spent on each outdoor activity session, N (%)
13.175
0.004
<Half an hour
119 (22.84)
104 (19.96)
0.015
≥Half an hour and < one hour
130 (24.95)
138 (26.49)
0.490
1.146
0.778
1.690
≥One hour and <2 hours
122 (23.42)
166 (31.86)
0.054
1.516
0.993
2.317
≥2 hours
150 (28.79)
113 (21.69)
0.522
0.861
0.543
1.364
Average number of hours per week of outdoor activities, N (%)
0.035
0.852
<3 hours
241 (46.26)
244 (46.83)
≥3 hours
280 (53.74)
277 (53.17)
0.338
0.845
0.599
1.192
Average number of hours per week of indoor activities, N (%)
