Evaluation of measurement properties of the Impact of Weight on Quality of Life-Lite (IWQOL-Lite) instrument among Chinese overweight and obese populations

Table 5 Discriminative capacity and univariate analyses for IWQOL-Lite scores among different BMI sub-groups (N = 1,000)

	Mean (SD)				P value	Scheffe post hoc test	Effect size ^a (95% CI)
	I: 24 ≤ BMI < 26 (N = 406)	II: 26 ≤ BMI < 28 (N = 271)	III: 28 ≤ BMI < 30 (N = 151)	IV: BMI ≥ 30 (N = 172)	P value	Scheffe post hoc test	Effect size ^a (95% CI)
Total score	82.9 (17.1)	79.0 (17.6)	71.2 (23.9)	73.5 (23.1)	< 0.001	I > III*, I > IV, II > III, II > IV	0.615 (0.424, 0.805)
Physical function	83.6 (16.6)	79.2 (18.2)	70.9 (25.1)	73.8 (23.6)	< 0.001	I > II, I > III, I > IV, II > III, II > IV	0.662 (0.471, 0.853)
Self-esteem	78.8 (21.5)	76.0 (20.2)	69.3 (25.4)	69.6 (25.4)	< 0.001	I > III*, I > IV, II > III, II > IV*	0.421 (0.233, 0.610)
Sexual life	83.7 (18.7)	79.2 (19.8)	71.4 (26.8)	75.4 (25.9)	< 0.001	I > III*, I > IV, II > III**	0.580 (0.390, 0.770)
Public distress	85.5 (20.4)	82.1 (20.0)	73.6 (26.7)	75.9 (25.3)	< 0.001	I > III*, I > IV, II > III, II > IV	0.533 (0.344, 0.773)
Work	84.5 (18.8)	79.9 (19.7)	72.0 (25.8)	74.5 (25.3)	< 0.001	I > III*, I > IV, II > III*	0.596 (0.405, 0.786)

One-way analyses of variance and Scheffe post hoc tests were performed to compared the IWQOL-Lite scores among different BMI sub-groups
BMI: Body Mass Index, equals weight(kg) divided by height(m) squared. BMI groups were defined according to the guideline published by the Cooperative Meta-analysis Group of China Obesity Task Force in 2002
^aThe effect size was calculated as the difference between the mean scores of two sub-groups divided by the pooled standard deviation. An effect size of 0.8 is defined as large, 0.5 to 0.79 as moderate, and 0.2 to 0.49 as small
*p < 0.05; **p < 0.01; ***p < 0.001

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