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Table 1 Baseline characteristics of all participants (n = 246)

From: Expectations, perceptions, and physiotherapy predict prolonged sick leave in subacute low back pain

Continuous variables Mean SD Median
Age 41.1 10.7 39
Back pain intensity (1-10) 6.8 2.0 7
Pain during activity (1-9) 5.7 2.1 6
Pain while resting (1-9) 4.1 2.1 4
Roland Morris Questionnaire 8.8 4.3 9
Categorical variables n %  
Civil status    
   Married/cohabitant 192 78  
   Single/widow/divorced 53 21.5  
Education    
   Public school 1-12 years 181 73.6  
   University/Postgraduate college 41 16.7  
HSCL-25    
   Psychological distress (>1.75) 82 33.3  
   No psychological distress (<1.75) 151 61.4  
Perceived reduced ability to walk due to complaints    
   Inability to walk more than 1 km 88 35.8  
   Able to walk more than 1 km 131 53.3  
Sleep problems due to pain:    
   Some, often or all the time 193 78.5  
   Never or seldom 48 19.5  
Expectations regarding return to work:    
   Negative expectations 140 56.9  
   Positive expectations 93 37.8  
Physiotherapy prior to participation in the trial:    
   Had received PT prior to the trial 141 57.3  
   Had not received PT prior to the trial 102 41.5  
Perceived physical workload:    
   Constant back strain more than half of the time 183 74.4  
   Constant back strain less than half of the time 53 21.5  
Previous sick leave episodes due to LBP:    
   One or none previous episodes 107 43.5  
   Two or more previous episodes 137 55.7  
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