Table 3.
Changes of dioptre of subjects with normal visual acuity before and after experiment.
| Group | Dioptre before experiment (D) | Post-experimental dioptre (D) | P # | P & | P ∮ | P £ | P § |
|---|---|---|---|---|---|---|---|
| Outdoor exercise group | 1.56 ± 0.25 | 1.26 ± 0.28 | 0.000** | — | 0.148 | 0.997 | 0.001** |
| Outdoor control group | 1.51 ± 0.20 | 1.12 ± 0.14 | 0.000** | — | — | 0.215 | 0.031* |
| Indoor exercise group | 1.64 ± 0.24 | 1.23 ± 0.21 | 0.000** | — | — | — | 0.001** |
| Indoor control group | 1.52 ± 0.22 | 0.95 ± 0.24 | 0.000** | — | — | — | — |
# means comparison of differences within the group, & means comparison with outdoor sports group, ∮means comparison with outdoor control group, £ means comparison with indoor sports group, § means comparison with indoor control group, *means p < 0.05, **means p < 0.01.