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 2 Discrepancies in self-reported weights and heights and end-digit rounding preference by measured BMI category separately for men and women

			Weight				Height
Measured BMI Category^a	N (%)		Discrepancy (SR^b - Measured) Kg, mean (95%CI)		Percent reporting end-digit 0 or 5 % (95% CI)		Discrepancy (SR^b - Measured) cm, mean (95%CI)		Percent reporting end-digit 0 or 5 % (95% CI)
Men
Underweight (<18.5)	5	(1)	1.13	(0.40, 1.86)*	0%	(0%, 52%)	-1.40	(-5.78, 2.98)	0%	(0%, 52%)
Normal (18.5-<23)	133	(37)	-0.08	(-0.46, 0.29)	29%	(21%, 37%)*	1.18	(0.80, 1.56)***	32%	(24%, 41%)***
Overweight (23-<25)	88	(25)	-1.34	(-2.18, -0.50)**	36%	(26%, 47%)***	1.69	(1.20, 2.17)***	36%	(26%, 47%)***
Obese (25+)	132	(37)	-1.58	(-2.27, -0.89)***	36%	(28%, 45%)***	1.92	(1.57, 2.27)***	43%	(35%, 52%)***
Women
Underweight (<18.5)	36	(9)	1.18	(0.30, 2.06)**	19%	(8%, 36%)	1.65	(0.79, 2.51)***	44%	(28%, 62%)***
Normal (18.5-<23)	229	(60)	-0.38	(-0.59, -0.18)***	23%	(17%, 29%)	1.13	(0.93, 1.34)***	29%	(23%, 35%)***
Overweight (23-<25)	54	(14)	-0.94	(-1.45, -0.42)***	33%	(21%, 47%)*	1.36	(0.86, 1.87)***	39%	(26%, 53%)***
Obese (25+)	64	(17)	-2.21	(-2.89, -1.53)***	33%	(22%, 46%)*	1.83	(1.30, 2.35)***	41%	(29%, 54%)***

^a Using Thai classification (15)
^b SR = self-reported
*p < 0.05; **p < 0.01; ***p < 0.001 (for discrepancies, p-values were from paired t-tests; for end-digit tests, p-values were from exact binomial tests of proportion = 0.20)

ISSN: 1478-7954