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Table 4 Adjusted RR of recovery from PBP * associated with levels of main exposures by sex and SRH

From: The influence of self-reported leisure time physical activity and the body mass index on recovery from persistent back pain among men and women: a population-based cohort study

Self-rated health (SRH) a
Exposure Men (n=621) b Women (n=1176) b
   Good SRH c   Poor SRH c   Good SRH c   Poor SRH c
   (n=217, 35%)   (n=404, 65%)   (n=377, 32%)   (n=799, 68%)
  n RR (95% CI) n RR (95% CI) n RR (95% CI) n RR (95% CI)
PA d         
 Sedentary e, j 24 Ref. 108 Ref. 55 Ref. 232 Ref.
 Low f 107 0.82 (0.41, 1.62) 213 0.77 (0.49, 1.22) 191 1.66 (0.91, 3.03) 403 1.36 (0.91, 2.03)
 Moderate g 48 0.81 (0.38, 1.75) 52 0.92 (0.49, 1.72) 79 1.65 (0.86, 3.18) 109 1.34 (0.78, 2.30)
 High h 38 0.74 (0.33, 1.64) 31 0.76 (0.32, 1.80) 52 1.35 (0.65, 2.83) 55 1.77 (0.96, 3.27)
BMI i         
 Overweight j 130 Ref. 278 Ref. 152 Ref. 441 Ref.
 Normal weight 87 1.24 (0.84, 1.85) 126 0.77 (0.49, 1.22) 225 1.07 (0.76, 1.50) 358 1.13 (0.82, 1.56)
  1. Note: Risk ratio (RR) together with corresponding 95% confidence interval (95% CI). Men and women are reported separately and presented by good and poor self-rated health.
  2. * Recovered from persistent back pain (PBP) = “No periods of considerably disturbing back pain lasting for 7 days or more, during the latest 5-year period”. Reported at follow-up in 2007.
  3. a Good = very good and good self-rated health; Poor = fair, poor and very poor self-rated health.
  4. b Number of participants was less than the study population according to missing values in self-rated health. Eleven men and 28 women had missing values in self-rated health.
  5. c Adjusted log-binomial regression model including PA, BMI, age and neck pain for men and PA, BMI and age for women.
  6. d PA: Self-reported regular leisure time physical activity the latest 12 months. Reported at baseline in 2002.
  7. e Sedentary: Mostly sedentary or low intensive activity like walking or cycling < 2 hours a week.
  8. f Low: Low intensive activity like walking or cycling ≥ 2 hours a week.
  9. g Moderate: At least 30 min activity, 1-2 sessions per week with activities like running, swimming, tennis, aerobics or similar.
  10. h High: At least 30 min activity, ≥ 3 sessions per week with activities like running, swimming, tennis, aerobics or similar.
  11. i BMI: Overweight; BMI ≥ 25, Normal weight; BMI < 25. Reported at baseline in 2002.
  12. j Reference category (RR = 1.00).