Validity of self-reported weight, height, and body mass index among university students in Thailand: Implications for population studies of obesity in developing countries

Table 3 Test values for diagnosis of obesity and overweight/obesity based on self-reported data comparing standard Thai BMI thresholds and reduced BMI thresholds, and effects on prevalence estimates

	Sensitivity	Specificity	Positive predictive value (PPV)	Negative predictive value (NPV)	Measured prevalence	Self-reported prevalence	TCS^a self-reported prevalence
Obesity
Men
Thai BMI threshold (≥25)	74.2	97.3	94.2	86.6	36.9	29.1	22.7
Reduced BMI threshold (≥24.5)	81.1	93.8	88.4	89.5	-	33.8	28.0
Women
Thai BMI threshold (≥25)	71.9	100.0	100.0	94.7	16.7	12.0	10.0
Reduced BMI threshold (≥24.4)	85.9	98.1	90.1	81.4	-	15.9	12.2
Overweight/Obese
Men
Thai BMI threshold (≥23)	77.7	93.5	95.0	72.5	61.5	50.3	44.4
Reduced BMI threshold (≥22.4)	87.7	86.2	91.0	81.4	-	58.9	51.8
Women
Thai BMI threshold (≥23)	77.1	99.2	97.8	90.7	30.8	24.3	19.6
Reduced BMI threshold (≥22.5)	87.3	97.0	92.8	94.5	-	29.0	23.2

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