Table 2.
Self-reported and measured weight, height and BMI among adolescents, Xi'an, China
| Items | Weight(kg) | Height(cm) | BMI(kg/m2) |
|---|---|---|---|
| Measured value (mean ± S.D.) | 50.5 ± 10.9 | 158.7 ± 8.4 | 19.9 ± 3.1 |
| Reported value (mean ± S.D.) | 48.2 ± 10.3 | 160.1 ± 8.7 | 18.7 ± 3.0 |
| Pearson's correlationa | 0.912 | 0.935 | 0.809 |
| Intraclass correlation | 0.85 | 0.898 | 0.796 |
| Weighted Kappaa, b | 0.86 | 0.91 | 0.75 |
| 95% confidence interval | 0.84, 0.88 | 0.90, 0.92 | 0.74, 0.76 |
| Mean differencea, c | -2.35 | 1.36 | -1.23 |
| 95% confidence interval | -2.56, -2.14 | 1.21, 1.51 | -1.32, -1.14 |
| Mean absolute differencea | 3.36 | 2.43 | 1.64 |
| 95% confidence interval | 3.19, 3.54 | 2.31, 2.54 | 1.56, 1.71 |
a Between reported data and measured data.
b Weight, height and BMI values were ranked and divided into quintiles, and quadratic weighted Kappa statistics are presented.
c Reported data minus measured data.