Table 3

 Comparison of dementia cases with population controls and with ambulatory controls, separately

VariableC%Dementia cases (n = 195) v population controls (n = 122)Dementia cases (n = 195) v ambulatory controls (n = 107)
RAdj. OR†95% CIR%Adj. OR†95% CI
C, cases; R, control group subjects.
In the assessment of the time weighted mean score of psychosocial exposures, probands with <10 years estimable worktime were excluded from analysis.
*To calculate tests for trend, the exposure scores were included as continuous variables in the logistic regression model.
†Adjusted for age, region, sex, dementia in parents, education, smoking (pack-years), and psychosocial network at age 30.
Challenge at work (time weighted mean score on a composite scale 1–5)
    ⩽3.56432.82732.81.02523.41.0
    >3.5, <4.59850.37763.10.50.2 to 1.06560.70.40.2 to 1.0
    ⩾4.5
    p for trend*p = 0.03p = 0.1
Social climate at work (time weighted mean score on a composite scale 1–5)
    ⩽3.58141.55545.11.05147.71.0
    >3.5, <4.58141.54940.21.40.7 to 2.64138.31.60.8 to 3.1
    ⩾4.5
    p for trend*p = 0.47p = 0.24
Control possibilities at work (time weighted mean score on a composite scale 1–5)
    ⩽3.53216.41814.81.0109.31.0
    >3.5, <4.513066.78670.50.60.3 to 1.48276.60.50.2 to 1.2
    ⩾4.5
    p for trend*p = 0.44p = 0.02
Work load (time weighted mean score on a composite scale 1–5)
    ⩽2.02211.31915.61.01110.31.0
    >2.0, <3.06231.84738.51.50.5 to 4.24844.90.70.2 to 2.1
    ⩾3.07840.03831.13.81.3 to 11.03330.81.80.6 to 5.7
    p for trend*p = 0.26p = 0.23
Perceived risks for error at work (time weighted mean score on a composite scale 1–5)
    ⩽2.010553.87259.01.06056.11.0
    >2.0, <3.03920.02117.20.90.4 to 2.12422.41.10.4 to 2.6
    ⩾3.0189.2119.01.20.4 to 3.987.53.41.0 to 11.8
    p for trend*p = 0.08p = 0.001
Social demands at work (time weighted mean score on a composite scale 1–5)
    ⩽3.511458.57259.01.05955.11.0
    >3.5, <4.54523.12722.11.60.7 to 3.32927.11.00.5 to 2.1
    ⩾4.531.554.10.40.1 to 2.643.70.30.05 to 2.4
    p for trend*p = 0.81P = 0.06
Supervisor support (time weighted mean score on a composite scale 1–5)
    ⩽3.53316.92016.41.01514.01.0
    >3.5, <4.512564.18267.20.70.3 to 1.77772.00.70.3 to 1.6
    ⩾4.5
    p for trend*p = 0.28p = 0.28
Working time arrangements (time weighted mean score on a scale 0–2)
    02211.3119.01.087.51.0
    >0, <0.511961.07964.80.80.3 to 2.17267.31.00.3 to 3.2
    ⩾0.52110.81411.50.90.2 to 3.41211.21.20.3 to 5.0
    p for trend*p = 0.32p = 0.13