Table 1. Characteristics of participants of the China Health and Nutrition Survey, 1991−2018.
| Items | 1991 | 2000 | 2009 | 2018 |
| No. of subjects | 8,407 | 9,962 | 9,644 | 14,619 |
| Age | ||||
| 18−44 | 5,306 (63.1) | 5,214 (52.3) | 3,674 (38.1) | 4,091 (28.0) |
| 45−59 | 1,841 (21.9) | 2,874 (28.9) | 3,364 (34.9) | 4,888 (33.4) |
| ≥60 | 1,260 (15.0) | 1874 (18.8) | 2,606 (27.0) | 5,640 (38.6) |
| Gender | ||||
| Male | 3,964 (47.2) | 4,812 (48.3) | 4,614 (47.8) | 6,738 (46.1) |
| Female | 4,443 (52.8) | 5,150 (51.7) | 5,030 (52.2) | 7,881 (53.9) |
| Area | ||||
| Urban | 2,904 (34.5) | 3,152 (31.6) | 3,008 (31.2) | 4,984 (34.1) |
| Rural | 5,503 (65.5) | 6,810 (68.4) | 6,636 (68.8) | 9,635 (65.9) |
| Region | ||||
| North | 3,031 (36.0) | 4,280 (43.0) | 4,127 (42.8) | 5,664 (38.7) |
| South | 5,376 (64.0) | 5,682 (57.0) | 5,517 (57.2) | 8,955 (61.3) |