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Table 1 Demographic characteristics of the sample (n = 204)

From: Reliability of the Multidimensional Pain Inventory and stability of the MPI classification system in chronic back pain

Dimension  
Diagnosis chronic back pain (%) 82
Diagnosis fibromyalgia (%) 15
Diagnosis, other (%) 3
Average age, min-max (years) 46.8 (16.7–72.8)
Average beginning of symptoms, min-max (years) 10.4 (0.25–64.5)
Sex: female (%) 71.1
Education: none (%) 1
Education: Grade 10–12 (%) 31
Education: High school graduate (%) 55
Education: College graduate (%) 9
Education: University graduate (%) 4
Employment status: inability for work (%) 50.5
Employment status: full-time (%) 28.9
Smoking: yes (%) 43
Marital status: single (%) 23
Marital status: married (%) 66
Marital status: other (%) 11