Table 3 Regression analysis for BMI z-score × weight perception interaction

PedsQL	All			Males			Females
	Coef	Robust s.e.m.	P	Coef	Robust s.e.m.	P	Coef	Robust s.e.m.	P
Global
BMI z-score	−0.23	0.38	0.56	0.48	0.44	0.29	−1.12	0.64	0.11
Weight perception (right weight–base)
Underweight	−2.25	0.47	0.001	−2.24	0.8	0.018	−1.94	0.68	0.02
Overweight	−2.68	1.1	0.03	−1.76	1.43	0.24	−3.29	1.2	0.02
BMI z-score × weight description (right weight–base)
Underweight	0.95	0.4	0.04	0.37	0.71	0.6	1.73	0.66	0.02
Overweight	−0.72	0.81	0.39	−1.7	0.98	0.11	0.39	1.15	0.74
Psychosocial
BMI z-score	−0.33	0.44	0.47	0.42	0.54	0.45	−1.23	0.7	0.1
Weight description (right weight–base)
Underweight	−2.58	0.52	<0.001	−2.41	0.87	0.02	−2.48	0.65	0.003
Overweight	−4.1	1.43	0.01	−2.96	1.76	0.12	−4.8	1.51	0.009
BMI z-score × weight description (right weight–base)
Underweight	1.2	0.57	0.06	0.66	0.89	0.47	1.84	0.82	0.04
Overweight	−0.04	0.93	0.97	−0.97	1.15	0.41	0.88	1.27	0.5
Physical
BMI z-score	0.12	0.22	0.57	0.41	0.33	0.24	−0.28	0.44	0.53
Weight description (right weight–base)
Underweight	−1.7	0.41	0.002	−2.28	0.62	0.004	−0.55	0.82	0.52
Overweight	−0.69	0.71	0.35	−0.6	0.97	0.55	−0.66	0.78	0.41
BMI z-score × weight description (right weight–base)
Underweight	0.37	0.48	0.45	0.4	0.74	0.59	0.49	0.59	0.42
Overweight	−2.04	0.59	0.006	−2.46	0.72	0.006	−1.43	0.71	0.07

Abbreviations: BMI, body mass index; BMI-z, standardised body mass index; Coef, coefficient. Bolded values are significant at P<0.05.

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