Table 1 Characteristics of myopia-related variables among grade 7 and grade 1 samples
From: Low prevalence of myopia among school children in rural China
Variables | Grade 1 Sample | Grade 7 Sample | P |
|---|---|---|---|
Girls(%) | 1089 (44.8) | 1133 (48.3) | 0.015 |
BMI, kg/m2 (SD) | 15.3 (2.5) | 18.9 (2.7) | < 0.001 |
Parental myopia(%) | 352 (14.5) | 129 (5.6) | < 0.001 |
Time on reading and writing per day after school, hours (SD) | 0.92 (0.57) | 0.93 (0.67) | 0.38 |
Time on computer per day, hours (SD) | 1.42 (1.30) | 0.90 (0.90) | < 0.001 |
Time outdoors per day, hours (SD) | 2.60 (0.19) | 1.34 (1.03) | < 0.001 |
Time on watching TV per day, hours (SD) | 0.79 (0.43) | 1.38 (0.91) | 0.001 |