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Table 2 Multinomial logistic regression model estimating the predictive effect (OR and 95% CI) of levels of BMI and levels of physical work load on the development of low back pain

From: The greatest risk for low-back pain among newly educated female health care workers; body weight or physical work load?

Low back pain 1–7 days
  BMI Physical work load
  Normal Overweight Obese Low Moderate High
Model I a Ref. 0.95/|0.59-1.51| 0.91/|0.50-1.68| Ref. 1.43/|0.85-2.39| 2.02*/|1.23-3.33|
Model II b Ref. 1.05/|0.65-1.70| 0.92/|0.49-1.73| Ref. 1.25/|0.74-2.12| 1.78*/|1.06-2.98|
Low back pain over 7 days
  BMI Physical work load
  Normal Overweight Obese Low Moderate High
Model I a Ref. 1.07/|0.72-1.60| 0.81/|0.46-1.42| Ref. 1.35/|0.85-2.13| 2.16*/|1.39-3.34|
Model II b Ref. 1.09/|0.72-1.65| 0.79/|0.45-1.41| Ref. 1.18/|0.74-1.89| 1.78*/|1.13-2.80|