|  | n |
| S | F | P value |
---|---|---|---|---|---|---|
Socioeconomic development level of urban area | high level(Wuhan) | 501 | 3.11 | 0.70 | 9.513 | 0.000 |
 | medium level(Shiyan) | 476 | 3.29 | 0.73 |  |  |
 | low level(Jingmen) | 474 | 3.13 | 0.74 |  |  |
Grade of state-owned medical institution | first grade | 368 | 3.19 | 0.71 | 0.319 | 0.727 |
 | second grade | 489 | 3.15 | 0.74 |  |  |
 | third grade | 594 | 3.18 | 0.72 |  |  |
Total sample | 1451 | 3.18 | 0.73 | -- |