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Factors Related to Affected Level Based on Multiple Logistic Regression Analysis
| Affected level | Odds Ratio (95% Confidence Interval) | P | |
| Upper | Back pain (initial) | 2.31 (1.14-4.66) | 0.02 |
| Middle | Back pain (initial) | 2.22 (1.13-4.39) | 0.02 |
| Lower | Low back pain (initial) | 5.12 (2.47-10.60) | <0.01 |
