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Table 2 Mean* number of days duration for sick leave periods with 95% confidence intervals (CI), unadjusted and adjusted

From: Sick leave patterns in common musculoskeletal disorders – a study of doctor prescribed sick leave

Women Unadjusted means Adjusted means**
Disease group (ICD 10) Mean 95% CI Mean 95% CI
Low back pain (M54) 26 23-29 26 24-28
Disc disorders (M51) 161 129-201 150 130-173
Knee osteoarthritis (M17) 90 71-114 81 69-95
Hip osteoarthritis (M16) 120 68-211 116 85-158
Rheumatoid arthritis (M05-M06) 154 122-195 147 119-183
Myalgia (M79) 30 25-36 27 24-31
Age category     
18-29 35 27-46 35 27-46
30-44 48 41-56 48 41-56
45-54 47 40-55 48 41-56
55-64 57 46-71 54 44-67
Men Unadjusted means Adjusted means**
Disease group (ICD 10) Mean 95% CI Mean 95% CI
Low back pain (M54) 25 23-28 25 23-28
Disc disorders (M51) 138 115-166 139 116-167
Knee osteoarthritis (M17) 77 63-95 75 61-93
Hip osteoarthritis (M16) 118 183-169 114 79-163
Rheumatoid arthritis (M05-M06) 157 87-285 152 84-277
Myalgia (M79) 24 20-29 24 20-29
Age category     
18-29 28 22-36 28 22-35
30-44 40 35-46 40 35-46
45-54 39 33-45 39 33-45
55-64 50 42-60 50 41-59
Women and men Unadjusted means Adjusted means***
Disease group (ICD 10) Mean 95% CI Mean 95% CI
Low back pain (M54) 26 24-28 26 24-28
Disc disorders (M51) 148 128-171 149 130-172
Knee osteoarthritis (M17) 83 71-97 81 69-95
Hip osteoarthritis (M16) 119 88-161 117 86-159
Rheumatoid arthritis (M05-M06) 154 125-191 148 119-183
Myalgia (M79) 27 24-31 27 24-31
Age category     
18-29 31 26-37 31 26-37
30-44 44 39-48 44 40-49
45-54 43 38-48 43 38-48
55-64 53 47-61 52 45-60
Sex     
Women 47 43-52 46 43-51
Men 40 36-43 40 37-44
  1. *Means are back transformed geometrical means from an ANCOVA on the natural logaritm of the sick leave days.
  2. **Numbers for disease group are adjusted for age and numbers for age groups are adjusted for disease group.
  3. ***Numbers for disease group are adjusted for age and sex, numbers for age groups are adjusted for disease group and sex and numbers for sex are adjusted for age and disease group.