Table 4.
Validity of Ethiopian and Caucasian BF% prediction equation in detecting obesity among validation sample of Ethiopian adults as compared with the obesity determined using ADP.
| Sex | Obesity based BF% | TP(a) | FP(b) | FN(c) | TN(d) | Total | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | Kappa | Agreement | P |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Males | Caucasian equation Predicted > 25 | 14 | 1 | 66 | 73 | 154 | 17.5 | 98.6 | 93.3 | 52.5 | 0.156 | Slight | 0.001 |
| Ethiopian equation Predicted > 25 | 60 | 6 | 14 | 68 | 154 | 81.1 | 91.9 | 90.9 | 82.9 | 0.741 | Substantial | <0.001 | |
| Females | Caucasian equation Predicted > 35 | 64 | 0 | 71 | 63 | 198 | 47.4 | 100.0 | 100.0 | 47.0 | 0.365 | Fair | <0.001 |
| Ethiopian equation Predicted > 35 | 118 | 8 | 17 | 56 | 198 | 87.4 | 87.5 | 93.7 | 76.7 | 0.720 | Substantial | <0.001 |
Sensitivity = a/a + c, specificity = d/b + d, positive predictive value (PPV) = a/a + b, negative predictive value (NPV) = d/c + d.
Kappa agreement (0 = no/poor), (0.01–0.20 = slight), (0.21–0.40 = fair), (0.41–0.60 = moderate), (0.61–0.80 = substantial), and (0.81–1.00 = almost perfect) [35].
ADP measured body fat percentage >25 for males and >35 for females was used as a a confirmatory test [14].
A similar cut-off was used for body fat percent predicted using Ethiopian Equation and Caucasian prediction equation.
ADP: air displacement Plethysmography.