Table 5. AUCs, optimal cut-off and validity parameters of anthropometric indices in predicting hypertension.
ROC analysis for hypertension (both stage 1 and 2) included 1055 girls (915 Normal, 128 HTN-1 and 12 HTN-2) and 1086 boys (956 Normal, 117 HTN-1 and 13 HTN-2). Prehypertension included 1055 girls (915 Normal, 140 Prehypertension) and 1250 boys (956 Normal, 294 Prehypertension). zfba and zwfa were calculated from the data itself by “BCCG” method. Labels 0 and 1 were used for control and disease, respectively. Hypertension- 0: Normal, 1: HTN-1/HTN-2; Prehypertension- 0: Normal, 1: Prehypertension. ROC: Receiver operator characteristic, AUC: Area under receiver operator characteristic curve, CI: confidence interval, zbfa: Z-score of body mass index for age, zwfa: Z-score of waist circumference for age, WHtR: waist to height ratio, HTN-1: Stage 1 Hypertension, HTN-2: Stage 2 Hypertension, BCCG: Box-Cox-Cole-Green.
| Variables | Girls | Boys | ||||
|---|---|---|---|---|---|---|
| zbfa | zwfa | WHtR | zbfa | zwfa | WHtR | |
| Hypertension | ||||||
| AUC (95% CI) | 0.55 (0.5-0.6) | 0.64 (0.59-0.68) | 0.66 (0.62-0.71) | 0.67 (0.62-0.72) | 0.61 (0.56-0.66) | 0.62 (0.57-0.67) |
| Cutoff | 0.12 | 0.29 | 0.46 | 0.29 | 0.41 | 0.44 |
| Sensitivity | 51.43% | 56.43% | 67.14% | 63.08% | 50.77% | 60.77% |
| Specificity | 57.38% | 63.93% | 59.23% | 66.21% | 69.87% | 55.75% |
| Prehypertension | ||||||
| AUC (95% CI) | 0.58 (0.52-0.63) | 0.57 (0.51-0.62) | 0.58 (0.52-0.63) | 0.59 (0.55-0.63) | 0.56 (0.53-0.6) | 0.54 (0.5-0.57) |
| Cutoff | 0.4 | 0.3 | 0.47 | 0.09 | 0.03 | 0.43 |
| Sensitivity | 45.71% | 49.29% | 48.57% | 58.50% | 55.44% | 60.20% |
| Specificity | 69.29% | 64.37% | 67.65% | 58.68% | 54.92% | 49.48% |