Table 5.
Sensitivity, Specificity, AUC and Youden Index of BMI to Identify BF% in Association with General Obesity
| Cut-Off (kg/m2) | Sensitivity | Specificity | AUC | Youden Index | p | |
|---|---|---|---|---|---|---|
| Men | ||||||
| Total | 24.0 | 74.6(95% CI:70.7–78.2) | 65.1(95% CI:59.7–70.3) | 0.78(95% CI:0.75–0.81) | 0.40 | <0.05 |
| <50 years | 25.5 | 67.2(95% CI:53.7–79.0) | 83.7(95% CI:69.3–93.2) | 0.82(95% CI:0.72–0.88) | 0.51 | <0.05 |
| 50–69 years | 24.2 | 74.1(95% CI:68.2–79.4) | 65.5(95% CI:57.7–72.7) | 0.78(95% CI:0.73–0.81) | 0.40 | <0.05 |
| ≥70 years | 24.0 | 71.5(95% CI:63.4–78.7) | 73.7(95% CI:60.3–84.5) | 0.79(95% CI 0.74–0.83) | 0.46 | <0.05 |
| Women | ||||||
| Total | 25.1 | 65.8(95% CI:60.3–71.0) | 80.3(95% CI:75.7–84.3) | 0.80(95% CI:0.77–0.83) | 0.46 | <0.05 |
| <50 years | 23.9 | 100(95% CI:59.0–100) | 62.2(95% CI:44.8–77.5) | 0.85(95% CI:0.71–0.94) | 0.62 | <0.05 |
| 50–69 years | 25.1 | 65.5(95% CI:56.1–74.1) | 81.7(95% CI:74.9–87.3) | 0.79(95% CI:0.74–0.84) | 0.47 | <0.05 |
| ≥70 years | 23.1 | 89.3(95% CI:84.1–93.2) | 61.1(95% CI:52.8–68.9) | 0.81(95% CI 0.77–0.85) | 0.50 | <0.05 |
Notes: Significant difference (p < 0.05) of the AUC for BMI was compared with the gold criteria. All sensitivity and specificity represent percentages.
Abbreviations: BMI, body mass index; BF%, body fat percentage; AUC, area under curves; 95% CI, 95% confidence interval.