Research Article
Prevalence and Related Factors for Myopia in School-Aged Children in Qingdao
Table 4
Near work and outdoor activity time (hours per day) of the students.
| Age (years) | n | Near work (h/d) | Outdoor activity (h/d) | (Mean ± SD) | (Mean ± SD) |
| 10 | 562 | 3.32 ± 1.32 | 2.28 ± 1.21 | 11 | 559 | 3.42 ± 1.56 | 2.24 ± 1.26 | 12 | 536 | 3.41 ± 1.82 | 2.06 ± 1.32 | 13 | 561 | 3.78 ± 1.42 | 1.88 ± 1.12 | 14 | 752 | 4.32 ± 1.84 | 1.64 ± 1.14 | 15 | 783 | 4.62 ± 1.26 | 1.42 ± 0.96 | value | | | |
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