Table 4.

Errors in the classification of BMI categories and WC categories based on self-reported anthropometrics in Jiangsu, China (%)

Categories	SR			DM			Absolute Error			Relative Error
	Men	Women	All	Men	Women	All	Men	Women	All	Men	Women	All
BMI categories (kg/m2, according to the Chinese standard)
< 18.5	2.9	3.7	3.3	2.3	2.4	2.3	0.6	1.3	1.0	27.0	56.1	42.6
18.5–23.9	45.9	51.4	48.8	43.5	43.3	43.4	2.4	8.1	5.4	5.6	18.7	12.5
24.0–27.9	38.6	34.6	36.5	40.0	38.3	39.1	−1.4	−3.7	−2.6	−3.5	−9.7	−6.5
≥ 28.0	12.5	10.3	11.4	14.2	16.0	15.2	−1.6	−5.7	−3.9	−11.6	−35.8	−25.5
WC categories (cm, according to the IDF standard for Chinese)
< 90 of men/ <80 of women	64.4	51.3	56.4	66.1	41.8	52.3	−1.7	9.5	4.2	−2.6	22.6	8.0
≥ 90 of men/ ≥80 of women	35.6	48.7	43.6	33.9	58.2	47.7	1.7	−9.5	−4.2	5.1	−16.3	−8.7
BMI categories (kg/m2, according to the WHO standard)
< 18.5	3.0	5.2	4.0	2.5	4.7	3.6	0.5	0.4	0.4	20.5	9.5	11.6
18.5–24.9	61.6	69.9	65.5	57.3	60.4	58.8	4.3	9.5	6.7	7.6	15.7	11.4
25.0–29.9	29.4	21.3	25.6	33.7	29.1	31.4	−4.3	−7.8	−5.8	−12.7	−26.8	−18.5
≥ 30.0	6.0	3.7	4.9	6.6	5.8	6.2	−0.6	−2.1	−1.3	−9.0	−36.7	−21.0
WC categories (cm, according to the IDF standard for Americans)
< 102 of men/ <88 of women	95.7	82.4	88.6	95.2	79.3	87.2	0.4	3.1	1.4	0.5	3.9	1.6
≥ 102 of men/ ≥88 of women	4.3	17.6	11.4	4.8	20.7	12.8	−0.4	−3.1	−1.4	−9.2	−15.0	−10.6

Abbreviations: BMI body mass index, WC waist circumference, SR self-reported, DM directly measured; Absolute error = SR-DM, Relative error = Absolute error/DM*100, WHO World Health Organization, IDF International Diabetes Federation