Table 1.
Descriptive characteristics of study samples by age groups (n, %).
| Total | Middle | Young-Old | Old-Old | ||
|---|---|---|---|---|---|
| Characteristic n (%) | 17867 | 8867 (49.63) | 7250 (40.58) | 1750 (9.79) | P Value |
| Sex | 0.850 | ||||
| Male | 8608 (48.18) | 4253 (47.96) | 3509 (48.40) | 846 (48.34) | |
| Female | 9259 (51.82) | 4614 (52.04) | 3741(51.60) | 904 (51.66) | |
| Residence | 0.038 | ||||
| Rural | 11,720 (65.60) | 5897 (66.51) | 4686 (64.63) | 1137 (64.97) | |
| Urban | 6147 (34.40) | 2970 (33.49) | 2564 (35.37) | 613 (35.03) | |
| Marital status | <0.001 | ||||
| Single | 1770 (9.91) | 318 (3.59) | 791 (10.91) | 661 (37.77) | |
| Couple | 16,097 (90.09) | 8549 (96.41) | 6459 (89.09) | 1089 (62.23) | |
| Education | <0.001 | ||||
| No education | 3484 (19.50) | 695 (7.84) | 2010 (27.72) | 779 (44.51) | |
| Primary school | 4746 (26.56) | 1848 (20.84) | 2323 (32.04) | 575 (32.86) | |
| Secondary school | 6268 (35.08) | 4168 (47.01) | 1865 (25.72) | 235 (13.43) | |
| High school and above | 3369 (18.86) | 2156 (24.31) | 1052 (14.51) | 161 (9.20) | |
| Income quintiles | <0.001 | ||||
| RMB0–10,000 | 4445 (24.88) | 1057(11.92) | 2517(34.72) | 871(49.77) | |
| RMB10,001–20,000 | 2898 (16.22) | 1339 (15.10) | 1384 (19.09) | 175 (10.00) | |
| RMB20,001–40,000 | 4475 (25.05) | 2863 (32.29) | 1358 (18.73) | 254 (14.51) | |
| RMB40,001–80,000 | 3045 (17.04) | 1900 (21.43) | 931 (12.84) | 214 (12.23) | |
| RMB80,001–1,000,000 | 3004 (16.81) | 1708 (19.26) | 1060 (14.62) | 236 (13.49) | |
| Smoking | <0.001 | ||||
| Never-smoker | 13,110 (73.38) | 6562 (74.00) | 5231 (72.15) | 1317 (75.26) | |
| Ex-smoker | 943 (5.28) | 255 (2.88) | 538 (7.42) | 150 (8.57) | |
| Current-smoker | 3814 (21.35) | 2050 (23.12) | 1481 (20.43) | 283 (16.17) | |
| Drinking | <0.001 | ||||
| Never-drink | 12,290 (68.79) | 5882 (66.34) | 5076 (70.01) | 1332 (76.12) | |
| Drank more than 30 days ago | 823 (4.61) | 360 (4.06) | 369 (5.09) | 94 (5.37) | |
| Drank within last 30 days | 4754 (26.61) | 2625 (29.60) | 1805 (24.90) | 324(18.51) | |
| Number of weekly exercise times | <0.001 | ||||
| <=1 | 9161 (51.27) | 4807 (54.21) | 3452 (47.61) | 902 (51.54) | |
| >=2 | 8706 (48.73) | 4060 (45.79) | 3798 (52.39) | 848 (48.46) | |
| BMI | <0.001 | ||||
| Underweight | 664 (3.72) | 138 (1.56) | 313 (4.32) | 213 (12.17) | |
| Normal | 9874 (55.26) | 4754 (53.61) | 4078 (56.25) | 1042 (59.54) | |
| Overweight | 6268 (35.08) | 3386 (38.19) | 2458 (33.90) | 424 (24.23) | |
| Obese | 1061 (5.94) | 589 (6.64) | 401 (5.53) | 71 (4.06) | |
| Physical check-up last year | <0.001 | ||||
| No | 7539 (42.20) | 5005 (56.45) | 2167 (29.89) | 367 (20.97) | |
| Yes | 10,328 (57.80) | 3862 (43.55) | 5083 (70.11) | 1383 (79.03) | |
| Teeth-brushing daily | <0.001 | ||||
| No | 3578 (20.03) | 834 (9.41) | 1928 (26.59) | 816 (46.63) | |
| Yes | 14,289 (79.97) | 8033 (90.59) | 5322 (73.41) | 934 (53.37) |