Table 1.
Characteristics of the study population.
| NDVI | ||
|---|---|---|
| Low | High | |
| Sample size, n (%) | 64,398 (50.0) | 64,361 (50.0) |
| Sex, n (%) | ||
| Male | 32,265 (50.1) | 32,414 (50.4) |
| Female | 32,133 (49.9) | 31,947 (49.6) |
| Regions, n (%) | ||
| Rural | 34,344 (53.3) | 34,254 (53.2) |
| Urban | 30,054 (46.7) | 30,107 (46.8) |
| Age group, n (%) | ||
| 20–24 | 5,020 (7.8) | 5,139 (8.0) |
| 25–29 | 5,397 (8.4) | 5,341 (8.3) |
| 30–34 | 5,546 (8.6) | 5,407 (8.5) |
| 35–39 | 5,341 (8.3) | 5,258 (8.2) |
| 40–44 | 5,267 (8.2) | 5,473 (8.5) |
| 45–49 | 5,308 (8.2) | 5,471 (8.5) |
| 50–54 | 4,933 (7.7) | 5,253 (8.2) |
| 55–59 | 4,722 (7.3) | 4,974 (7.7) |
| 60–64 | 5,950 (9.2) | 5,476 (8.5) |
| 65–69 | 5,886 (9.1) | 5,590 (8.7) |
| 70–74 | 5,604 (8.7) | 5,654 (8.8) |
| 75–79 | 5,424 (8.4) | 5,262 (8.0) |
| Inner-province socio-economic status, n (%) | ||
| High | 23,521 (37.4) | 18,583 (29.0) |
| Middle | 19,901 (31.7) | 23,393 (36.5) |
| Low | 19,445 (30.9) | 22,091 (34.5) |
| Education level, n (%) | ||
| Primary school or lower | 15,594 (24.6) | 16,440 (25.7) |
| Junior high school | 13,574 (21.5) | 14,477 (22.6) |
| Senior high school | 11,016 (17.4) | 11,390 (17.8) |
| University and above | 23,088 (36.5) | 21,703 (33.9) |
| Career#, n (%) | ||
| Technical staff | 23,931 (37.9) | 22,878 (35.8) |
| Business people | 4,662 (7.4) | 3,933 (6.1) |
| Agricultural personnel | 15,789 (25.0) | 20,565 (32.1) |
| Other occupations | 18,736 (29.7) | 16,600 (25.9) |
| Nationality, n (%) | ||
| Han | 54,803 (85.1) | 58,418 (89.2) |
| Minority | 9,595 (14.9) | 6,943 (10.8) |
| Height, Mean (SD) | 163.3 (8.6) | 161.5 (8.7) |
| Weight, Mean (SD) | 65.4 (11.4) | 63.1 (11.2) |
| Physical activity, min/week, Mean (SD) | 162.5 (305.4) | 142.5 (282.2) |
| Sedentary time, min/week, Mean (SD) | 637.0 (676.6) | 625.6 (688.8) |
| BMI, kg/m2 | 24.2 (3.5) | 24.7 (3.6) |
| Relative HS&, median (IQR) | 0.489 (0.183) | 0.496 (0.185) |
BMI, Body mass index; NDVI, normalized difference vegetation index; SD, standard deviation; IQR, interquartile range. #Age above 60 years (the career was investigated before retirement). &Handgrip strength-to-body weight ratio is presented as median and IQR, whereas other continuous variables are expressed as mean and SD.