Association between protective behaviour and myopia prevalence
| Near work distance* (≧30 cm) (n=5880) | Continuous near work† (≦30 min) (n=5170) | More outdoor activity in recess‡ (n=7337) | ||||
| RR | RR 95% CI | RR | 95% CI | RR | 95% CI | |
| Time | (ref: <30 cm) | (ref: >30 min) | (ref : less outdoor) | |||
| T1 | 0.71 | (0.63 to 0.80) | 0.76 | (0.67 to 0.86) | 0.76 | (0.66 to 0.88) |
| T2 | 0.70 | (0.62 to 0.80) | 0.77 | (0.68 to 0.88) | 0.78 | (0.67 to 0.91) |
| T3 | 0.75 | (0.66 to 0.85) | 0.89 | (0.78 to 1.02) | 0.77 | (0.65 to 0.90) |
| T4 | 0.74 | (0.65 to 0.84) | 0.89 | (0.78 to 1.03) | 0.77 | (0.65 to 0.90) |
| T5 | 0.71 | (0.63 to 0.82) | 0.89 | (0.77 to 1.02) | 0.77 | (0.66 to 0.91) |
Association between protective behaviour and myopia prevalence: RR showed significant protective effect on myopia prevalence of three behaviors: near work distance≧30 cm, continuous near work≦30 min and more outdoor activity in recess. Model had adjusted for sex, paternal high myopia, maternal high myopia, myopia treatment and other two behaviours.
*Model adjusted for sex, paternal high myopia, maternal high myopia, myopia treatment, the time of continuous near work and the time of outdoor activity in recess.
†Model adjusted for sex, paternal high myopia, maternal high myopia, myopia treatment, near work distance and outdoor activity in recess.
‡Model adjusted for sex, paternal high myopia, maternal high myopia, myopia treatment, near work distance and the time of continuous near work.
RR, risk ratio.