Table 1 Differences between participants and matched controls, and the risk of disability pension by baseline characteristics
Partic-ipantsControlsDisability pension HR (95% CI)
Sex
    Men579 (26)2316 (26)1.10 (0.91 to 1.32)
    Women1657 (74)6628 (74)1
Age
    Mean age (SD) (10-year strata)47.3 (5.7)47.3 (7.7)3.59 (3.08 to 4.15)
Occupational status
    Higher grade non-manual735 (33)2940 (33)1
    Lower grade non-manual852 (38)3408 (38)1.76 (1.39 to 2.22)
    Manual649 (29)2596 (29)2.42 (1.92 to 3.05)
Prevalence of severe/chronic diseases
    Diabetes*18 (0.8)96 (1.1)2.80 (1.65 to 4.76)
    Hypertension*171 (7.7)768 (8.6)2.65 (2.13 to 3.29)
    Ischaemic heart disease*11 (0.5)89 (1.0)5.79 (3.71 to 9.05)
    Asthma*60 (2.7)221 (2.5)1.94 (1.30 to 2.89)
    Cancer49 (2.2)220 (2.5)1.88 (1.22 to 2.91)
    Any chronic disease*393 (17.6)1573 (17.6)3.16 (2.66 to 3.75)
Prescribed medication purchases
    Analgesics (DDDs/person year)
        None1540 (69.0)6952 (77.8)1
        <100615 (27.6)1713 (19.2)1.96 (1.63 to 2.36)
        ⩾10077 (3.4)269 (3.0)4.27 (3.17 to 5.75)
    Antidepressants (DDDs/
    person year)    
        None2083 (93.3)8529 (95.5)1
        <10060 (2.7)144 (1.6)3.71 (2.58 to 5.34)
        ⩾10089 (4.0)261 (2.9)4.72 (3.63 to 6.14)
  • *Based on eligibility for special medication reimbursement.

  • Figures are given as numbers (percentages) unless otherwise stated. 95% CI, 95% confidence interval; DDDs, defined daily doses; HR, hazard ratio.