Table 2.
The factor matrix of varimax-rotation
| Variable | Factor 1a | Factor 2a | Factor 3a | Factor 4a | Communalities |
|---|---|---|---|---|---|
| Average daily time spent watching TV | 0.7357 | 0.0962 | 0.032 | 0.0308 | 0.5525 |
| Average daily time spent using the computer | 0.7109 | 0.1844 | -0.0414 | -0.0869 | 0.5486 |
| Number of eye exercises done daily | 0.5803 | -0.1893 | -0.3087 | -0.1077 | 0.4795 |
| Average daily sleep duration | 0.5067 | -0.4183 | 0.2081 | 0.2562 | 0.5407 |
| Reading or looking at screens while walking or riding | 0.0154 | 0.8197 | -0.0244 | -0.0277 | 0.6735 |
| Whether lights are turned off when looking at night | 0.0756 | 0.8018 | 0.0476 | 0.0629 | 0.6549 |
| Parents’ visual condition | -0.0687 | 0.0837 | 0.7402 | -0.0554 | 0.5627 |
| Number of physical education classes per week | 0.3154 | -0.2349 | 0.4663 | 0.3796 | 0.5162 |
| Regularly exchange class seats | -0.0835 | 0.0094 | -0.014 | 0.7841 | 0.6221 |
| Lighting conditions when reading or writing at night | -0.0964 | -0.1243 | 0.4905 | -0.4945 | 0.5099 |
| Variance contribution rate (%) | 18.75 | 16.07 | 11.32 | 10.45 | -- |
| Cumulative variance contribution rate (%) | 18.75 | 34.82 | 46.15 | 56.60 | -- |
| Variable | Factor 1b | Factor 2b | Factor 3b | Factor 4b | |
|---|---|---|---|---|---|
| Sense of happy in life | 0.9147 | 0.0359 | 0.0191 | -0.0011 | 0.8383 |
| Feeling happiness | 0.9109 | 0.0555 | 0.0036 | 0.0170 | 0.8331 |
| Feeling hopeful about the future | 0.8122 | 0.0415 | -0.0354 | 0.0147 | 0.6629 |
| Grade | 0.0935 | 0.8446 | -0.1592 | 0.0724 | 0.7526 |
| Number of physical education classes per week | 0.0133 | 0.8020 | 0.1297 | -0.0241 | 0.6608 |
| Average daily sleep duration | 0.0533 | 0.7234 | 0.2477 | -0.1273 | 0.6037 |
| Number of eye exercises done daily | -0.1283 | 0.0188 | 0.7532 | -0.1446 | 0.6050 |
| Average daily outdoor activity time during daylight hours | 0.1408 | 0.0840 | 0.7242 | 0.1192 | 0.5655 |
| Parents’ visual condition | 0.0145 | 0.2099 | -0.1296 | 0.7198 | 0.5791 |
| Participation in tutorial classes | 0.0121 | -0.2786 | 0.0935 | 0.6973 | 0.5727 |
| Variance contribution rate (%) | 23.75 | 20.15 | 12.22 | 10.62 | -- |
| Cumulative variance contribution rate (%) | 23.75 | 43.89 | 56.12 | 66.74 | -- |
Note: Factors from 2018 are denoted as Factor 1a-Factor 4a; 2023 factors as Factor 1b-Factor 4b; Factor 1a: School lifestyle factor, Factor 2a: Eye behavior factor, Factor 3a: Family heredity and environment factor, Factor 4a: Classroom eye policy factor, Factor 1b: Psychological factor, Factor 2b: Adaptive eye regulation factor, Factor 3b: Active eye protection factor, Factor 4b: Family heredity and environment factor