Table 4

 Incidence rates and adjusted hazard ratios (HRs) of stroke in relation to asthma variables: ARIC, 1987–2000

Asthma definitionNo of eventsIncidence rate*Model 1 HR†95% CIModel 2 HR‡95% CI
Maximum number of person-years was 13 522 and maximum number of events was 438. Some subgroups have less because of missing data.
*Crude (per 1000 person-years).
†Model 1 adjusted for age, sex, race/centre.
‡Model 2 adjusted for age, sex, race/centre, HDL cholesterol, LDL cholesterol, systolic blood pressure, hypertension medication use, smoking status, pack years, W/H ratio, diabetes diagnosis, and sport score.
Ever354.221.651.17 to 2.331.501.04 to 2.15
    Former143.501.380.81 to 2.351.440.84 to 2.46
    Current204.801.931.23 to 3.021.550.95 to 2.52
Asthma duration
    Current or former
        ⩽20 years173.331.380.85 to 2.241.400.86 to 2.28
        >20 years135.022.071.16 to 3.491.530.81 to 2.87
Time dependent
    No asthma3942.771.01.0
    Asthma442.791.441.06 to 1.971.431.03 to 1.98
Wheeze attack
    No wheeze attack with shortness of breath3742.621.001.00
    Wheeze attack with shortness of breath644.091.571.21 to 2.061.561.18 to 2.06