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| Group | n | Autumn and winter | Spring and summer | Transitions of seasons | Throughout the year | Irregular |
|---|---|---|---|---|---|---|
| Urban area | 551 | 177 (32.1)a | 55 (10.0) | 161 (29.2) | 10 (1.8) | 148 (26.9) |
| Suburban area | 150 | 31 (20. 7) | 23 (15.3) | 50 (33.3) | 2 (1.3) | 44 (29.3) |
| Rural area | 142 | 18 (12.7) | 7 (4.9) | 84 (59.2) | 0 (0) | 33 (23.2) |
| χ2 value | 25.27 | 8.73 | 44.67 | 2.66 | 1.41 | |
| P value | <0.01 | <0.05 | <0.01 | >0.05 | >0.05 |
a, P<0.05, compared with the suburban and rural areas.
