Performance of newly developed body mass index cut-off for diagnosing obesity among Ethiopian adults

Table 4 Validity of BMI cut-off for detecting obesity among Ethiopian adults as compared to obesity based on the body fat percentage determined by the air displacement plethysmography (ADP)

Sex	Cut-off values	TP (a)	FP (b)	FN (c)	TN (d)	Total	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	Kappa	Agreement	P
Males	BMI ≥ 30 kg/m²	8	1	144	154	307	5.3	99.4	88.9	51.7	0.047	Slight	0.0160
Males	BMI > 22.2 kg/m^2a	133	19	19	136	307	87.5	87.7	87.5	87.7	0.752	Substantial	< 0.0001
Females	BMI ≥ 30 kg/m²	75	0	185	137	397	46.9	100.0	100.0	42.5	0.219	Fair	< 0.0001
Females	BMI > 24.5 kg/m^2a	208	6	52	131	397	80.0	95.6	97.2	71.6	0.701	Substantial	< 0.0001

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) (William et al., 2011). ADP measured body fat percentage > 25 for males and > 35 for females was used as a gold standard [20]. BMI cut-off for obesity ≥ 30 kg/m² is the WHO cut-off [20]
ADP air displacement plethysmography
^aEthiopian sex-specific cut-off for BMI for defining obesity based on the local data

ISSN: 1880-6805