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| Group | n | Morning | Afternoon | Before sleep | Midnight | Irregular |
|---|---|---|---|---|---|---|
| Urban area | 551 | 68 (12.3) | 9 (1.6) | 102 (18.5) | 132 (24.0) | 240 (43.6) |
| Suburban area | 150 | 34 (22.7) | 2 (1.3) | 17 (11.3) | 28 (18.7) | 69 (46.0) |
| Rural area | 142 | 21 (14.8) | 4 (2.8) | 0 (0) | 23 (16.2) | 94 (66.2) |
| χ2 value | 10.09 | 1.11 | 33.08 | 4.99 | 23.43 | |
| P value | <0.01 | > 0.05 | <0.05 | >0.05 | <0.01 |
