Table IV.

Results of multivariate analyses of variances of physical measures of the STarT Back screening tool (SBST) subgroups

Effect	df	Pillai	F-value	df (num, den)	p-value
SBST	2	0.07	2.90	8, 652	0.003*
Age	1	0.06	4.90	4, 325	< 0.001*
Gender	1	0.71	197.32	4, 325	< 0.001*
BMI	1	0.29	33.14	4, 325	< 0.001*
SBST:Age	2	0.04	1.47	8, 652	0.164
SBST:Gender	2	0.07	2.83	8, 652	0.004*
SBST:BMI	2	0.05	2.0	8, 652	0.044

BMI: body mass index; df: degrees of freedom; Pillai: Pillai’s trace statistic; F-value: multivariate test statistic, representing the ratio of model variance to error variance; num: numerator; den: denominator; p-value: significance value, interpreted against a Bonferroni-corrected alpha of 0.0167 (0.05/3) because 3 MANOVAs were performed.