Table 1.
The baseline characteristics of study participants using two different growth references.
| Variables | WHO reference | China reference | ||||
|---|---|---|---|---|---|---|
| Lower than overall prevalence | Higher than overall prevalence | P | Lower than overall prevalence | Higher than overall prevalence | P | |
| Sex ratio (girls = 100) | 104.97 (103.24, 107.26) | 105.8 (103.27, 108.34) | 0.330 | 105.01 (103.24, 107.28) | 105.79 (103.04, 108.05) | 0.473 |
| Proportion of non-agricultural household registration (%) | 34.17 (26.56, 45.5) | 24.05 (15.82, 33.73) | <0.001 | 34.12 (26.30, 45.50) | 23.88 (15.81, 34.16) | <0.001 |
| Education duration (years) | 9.29 (8.81, 10.09) | 8.75 (7.98, 9.07) | <0.001 | 9.27 (8.81, 10.09) | 8.71 (7.98, 9.17) | <0.001 |
| Altitude (m) | 245.65 (110.99, 1,024.29) | 628.27 (204.24, 1,167.81) | 0.040 | 238.55 (106.84, 1,024.29) | 657.18 (205.74, 1,174.63) | 0.018 |
| Annual mean relative humidity (%) | 64.36 (54.90, 76.2) | 80.27 (75.80, 83.16) | <0.001 | 64.50 (54.89, 76.77) | 80.47 (75.75, 83.16) | <0.001 |
| Annual mean sunshine (hours) | 2,152.05 (1,771.35, 2,560.03) | 1,641.82 (1,368.44, 2,084.11) | <0.001 | 2,142.54 (1,771.35, 2,560.03) | 1,640.15 (1,344.80, 2,086.73) | <0.001 |
| Annual mean temperature (°C) | 12.89 (7.03, 16.29) | 15.79 (12.31, 17.32) | 0.011 | 12.97 (7.03, 16.33) | 15.45 (12.24, 17.24) | 0.026 |
| Annual mean wind speed (m/s) | 22.02 (17.97, 26.36) | 17.31 (15.02, 19.62) | <0.001 | 22.25 (17.97, 26.42) | 17.18 (14.95, 19.60) | <0.001 |
| Annual mean rain (mm) | 709.41 (449.75, 1,541.05) | 1,773.10 (1,405.86, 2,039.10) | <0.001 | 726.71 (449.75, 1,551.53) | 1,743.37 (1,262.15, 2,028.19) | <0.001 |
WHO, World Health Organization. Data are expressed as interquartile range. P-value was calculated by the rank-sum test.