Table 8.

Contingency table of physical activity levels and VDS low back scores.

	VDS Levels
	Mild Pain		Moderate Pain		Severe Pain		Very Severe Pain		Total		χ2 *	τb **
	(n)	(%)	(n)	(%)	(n)	(%)	(n)	(%)	(n)	(%)	0.026	−0.09
No PA	46	8.3	80	14.4	42	7.6	12	2.2	180	32.5
Light PA	118	21.3	110	19.9	48	8.7	14	2.5	290	52.3
Moderate PA	18	3.2	18	3.2	12	2.2	0	0	48	8.7
High PA	14	2.5	10	1.8	8	1.4	4	0.7	36	6.5
Total	196	35.4	218	39.4	110	19.9	30	5.4	554

n: number; %: percentage, No PA: no physical activity; Light PA: <150 min/week of MVPA, Moderate PA: ≃150 min/week of MVPA; High PA: >200 min/week of MVPA; VDS: verbal descriptive scale; * Chi-square p-value; ** Kendall-tau value.