Table 1 Background characteristics, frequencies, percentage, median and inter-quartile range (IQR) for the sample
| Â | Not well-off (%) | Average (%) | Well-off (%) | |||
|---|---|---|---|---|---|---|
N (%) | Median (IQR) | N (%) | Median (IQR) | N (%) | Median (IQR) | |
Age group (NÂ =Â 824) | ||||||
 Adolescent | 29 (3.52) | 20 (10–40)k | 65 (7.89) | 26 (15–40)k | 11 (1.33) | 40 (30–50)k |
 Young | 142 (17.23) | 23.2 (18–37.5)k | 222 (26.94) | 35 (24–50)k | 53 (6.43) | 45 (30–75)k |
 Middle age | 108 (13.11) | 22 (15–30)k | 115 (13.96) | 30 (20–45)k | 21 (2.55) | 35 (20–48)k |
 Old age | 29 (3.52) | 21.36 (16–30)k | 26 (3.16) | 27.5 (20–40)k | 3 (0.36) | 200 (48–300)k |
Gender (NÂ =Â 825) | ||||||
 Male | 163 (19.76) | 24 (15–38)k | 201 (24.36) | 30 (20–50)k | 40 (4.85) | 40 (30–75)k |
 Female | 146 (17.70) | 20 (15–31)k | 227 (27.52) | 30 (20–45)k | 48 (5.82) | 40 (24–60)k |
Educational level (NÂ =Â 825) | ||||||
 Primary education | 185 (22.42) | 20 (14.4–30)k | 247 (29.94) | 27.15 (18.5–40)k | 41 (4.97) | 32 (23–47)k |
 Middle education | 97 (11.76) | 27 (18–40)k | 134 (16.24) | 37 (25–50)k | 29 (3.52) | 50 (30–72.5)k |
 Higher education | 27 (3.27) | 40 (20–50)k | 47 (5.70) | 50 (25–60)k | 18 (2.18) | 60 (35–150)k |
Family income (NÂ =Â 791) | ||||||
 CNY 0–19,999 | 95 (12.01) | 10 (8.5–15)k | 80 (10.11) | 12 (9.8–15)k | 8 (1.01) | 12.06 (10.5–14)k |
 CNY 20000- | 202 (25.54) | 30 (22–40)k | 328 (41.47) | 36 (26.25–50)k | 78 (9.86) | 45 (30–75)k |
SES group (NÂ =Â 797) | ||||||
 Lower class | 112 (14.05) | 20 (13–27)k | 125 (15.68) | 25.75 (19–40)k | 17 (2.13) | 37.5 (25 –49)k |
 Middle class | 87 (10.92) | 20 (12–33.3)k | 149 (18.70) | 30 (20–50)k | 29 (3.64) | 30 (26–50)k |
 Upper class | 104 (13.05) | 30 (20–46)k | 137 (17.19) | 35.6 (25–60)k | 37 (4.64) | 55 (32.5–80)k |