Table 9.
Contingency table of physical activity levels and low back pain frequency.
| Monthly Frequencies | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 Times/Month | 4 Times/Month | 8 Times/Month | 16 Times/Month | Total | χ2 * | τb ** | ||||||
| (n) | (%) | (n) | (%) | (n) | (%) | (n) | (%) | (n) | (%) | 0.037 | −0.05 | |
| No PA | 42 | 7.6 | 36 | 6.5 | 48 | 8.7 | 54 | 9.7 | 180 | 32.5 | ||
| Light PA | 66 | 11.9 | 74 | 13.4 | 92 | 16.6 | 58 | 10.5 | 290 | 52.3 | ||
| Moderate PA | 18 | 3.2 | 8 | 1.4 | 16 | 2.9 | 6 | 1.1 | 48 | 8.7 | ||
| High PA | 8 | 1.4 | 6 | 1.1 | 9 | 1.6 | 13 | 2.3 | 36 | 6.5 | ||
| Total | 134 | 24.2 | 124 | 22.4 | 165 | 29.8 | 131 | 23.6 | 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; * Chi-square p-value; ** Kendall-tau value.