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Table 1

Descriptive data of the study population

VariableDropoutsExcludedStudy sample
Number of subjects1822222
Age in years, mean (SDa)43 (11)41 (14)44 (11)
Sex distribution, %
 Men566450
 Women443649
Main type of occupation, %:
 Sitting382943
 Standing131922
 Varying372828
 Heavy12247
Pain intensity 0–10, mean (SDa)3.9 (3.1)5.4 (2.3)4.3 (2.2)
Presence of leg pain, %594749
Pain duration >30 days, %335759
a SD standard deviation