Table 2. Moderation effects of body height and sex on the effect of body weight on RMDQ score (N=72).

	b	(CI95%)	p
Unadjusted analysis
Body weight	-0.01	(-0.25; 0.22)	0.914
Body height	-0.24	(-0.53; 0.05)	0.109
Sex (women)	0.42	(-2.17; 3.01)	0.746
Interaction of body weight and body height	0.01	(-0.02; 0.04)	0.355
Interaction of body weight and sex (women)	0.05	(-0.22; 0.31)	0.736
Interaction of body height and sex (women)	0.30	(-0.67; 0.68)	0.106
Interaction of body height, body weight and sex (women)	-0.03	(-0.06; 0.00)	0.051
Adjusted analysis†
Body weight	-0.16	(-0.40; 0.07)	0.164
Body height	-0.32	(-0.60; -0.03)	0.028*
Sex (women)	0.20	(-2.29; 2.69)	0.872
Interaction of body weight and body height	0.03	(0.00; 0.06)	0.022*
Interaction of body weight and sex (women)	0.19	(-0.06; 0.45)	0.139
Interaction of body height and sex (women)	0.43	(0.07; 0.79)	0.020*
Interaction of body height, body weight and sex (women)	-0.06	(-0.09; -0.02)	0.001*
Covariates:
Age (years)	0.17	(0.02; 0.32)	0.031
Secondary or higher education (compared to primary)	-2.13	(-4.72; 0.47)	0.106
Moderate physical work (compared to hard)	0.87	(-1.59; 3.33)	0.482
Sedentary work or unemployed (compared to hard)	-1.17	(-3.81; 1.47)	0.379
Family history of low back pain	1.04	(-1.05; 3.14)	0.323
Diagnosis:     Lumboischialgia (compared to lumbar syndrome)	2.89	(0.89; 4.88)	0.005*
Locomotor comorbidities	0.02	(-2.06; 2.10)	0.986
Other chronic diseases	1.13	(-0.88; 3.15)	0.265

Values of body weight and body height were centered at their means before analysis; in sex, men were reference, and women targeted category; RMDQ = Roland Morris Disability Questionnaire; b = crude, unstandardized regression coefficient; CI = confidence interval; p = statistical significance calculated using linear regression

^†Analysis was adjusted for age, education, type of work, family history of low back pain, diagnosis, locomotor comorbidities and other chronic diseases

*False discovery rate <5%