Table 1 Sample characteristics (n = 4146)*
n%Mean (SD)
Age (years)414654.8 (5.69)
Sex
    Male298972
    Female115728
Employment grade level (phase 5/phase 7)
    1 Senior administrators (highest grade)889/107322/26
    2996/88924/22
    3592/62914/15
    4693/64117/15
    5508/49112/12
    6 Clerical/support (lowest grade)463/39711/10
    Missing5/26−/1
Smoking
    Never or former smokers377091
    Current smokers3428
    Missing341
Alcohol consumption (units of alcohol/week)
    None56714
    1–14 units/week205350
    15–21 units/week59514
    22 units/week or over82520
    Missing1062
Body mass index (kg/m2)414126.2 (8.50)
    Under 18.5612
    18.5–25261063
    25–30127232
    Over 301985
Depression
    No336081
    Yes78619
Hypertension
    No252161
    Yes162339
    Missing2
Phases 1–3
High-strain job over three phases
    No exposure251361
    One exposure101324
    Two exposures45811
    Three exposures1624
Active job over three phases
    No exposure180444
    One exposure94023
    Two exposures71817
    Three exposures68416
Phase 5 cognitive functions
    Verbal memory41467.0 (2.39)
    Inductive reasoning (AH4)414647.5 (10.67)
    Verbal meaning (Mill Hill)414625.2 (4.33)
    Phonemic fluency414617.1 (4.43)
    Semantic fluency414616.7 (4.19)
Phase 7 cognitive functions
    Verbal memory41466.9 (2.41)
    Inductive reasoning (AH4)414444.7 (10.87)
    Verbal meaning (Mill Hill)413625.1 (4.32)
    Phonemic fluency412616.0 (4.17)
    Semantic fluency413815.9 (3.87)
  • *Characteristics as at phase 5, unless otherwise stated.

  • AH4, Alice Heim intelligence test.