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Results of questionnaires from the two groups.
| Groups | Family income (RMB/month) | Nearwork time (minutes)/day | Outdoor time (hours)/day |
|---|---|---|---|
| PBM (n = 22) | 24,077 ± 11,763 (N = 13) | 62.95 ± 31.22 | 0.45 ± 1.86 |
| Control (n = 22) | 16,579 ± 9695 (N = 19) | 69.63 ± 44.71 | 0.59 ± 1.57 |
| P (t-test) | 0.092 | 0.700 | 0.542 |
PBM photobiomodulation therapy, Control single vision spectacles group, P value was decided by the independent sample.
