Table 1

 Description of the study populations with chronic low back pain and acute sciatic pain at baseline

TotalChronic low back painAcute sciatic pain
*During the previous 24 hours.
BMI, body mass index.
n724131
Age (years) (mean (SD))43.3 (10.2)42.2 (8.3)44.8 (12.4)
Female sex (n (%))43 (59.7%)27 (65.8%)16 (51.6%)
BMI (kg/m2) (mean (SD))27.0 (5.7)27.7 (6.8)26.1 (3.8)
    <2529 (40.3)17 (41.5)12 (38.7)
    25 to <3030 (41.7)15 (36.6)15 (48.4)
    ⩾3013 (18.0)9 (21.9)4 (12.9)
Smoking (n (%))
    Never26 (36.1%)15 (36.6%)11 (35.5%)
    Former21 (29.2%)9 (21.9%)12 (38.7%)
    Current25 (34.7%)17 (41.5%)8 (25.8%)
Education (formal schooling) (n (%))
    Up to 9 years33 (45.8%)19 (46.3%)14 (45.2%)
    10 years20 (27.8%)13 (31.7%)7 (22.6%)
    11 or more years19 (26.4%)9 (22.0%)10 (32.2%)
Alcohol consumption* (n (%))16 (22.2%)11 (26.8%)5 (16.1%)
Comorbidity (n (%))
    Hypertension8 (11.1%)2 (4.9%)6 (19.1%)
    Diabetes1 (1.4%)1 (2.4%)0