Table 2 Relative risks of lung cancer in women by statusa and quantity of aspirin use

From: Aspirin and lung cancer risk in a cohort study of women: dosage, duration and latency

   

Age-adjusted

Smoking-adjusted

 

P-Y b

Cases

RRc (95% CId)

RRe (95% CId)

Never aspirin use

418.0

236

1.00

1.00

Past aspirin use

501.9

405

0.84 (0.71–0.99)

0.97 (0.82–1.15)

Current aspirin use

1016.0

719

0.91 (0.78–1.06)

1.00 (0.86–1.16)

1–2 tablets per week

445.1

234

0.73 (0.60–0.87)

0.84 (0.70–1.02)

3–5 tablets per week

201.8

134

0.86 (0.70–1.07)

0.98 (0.79–1.21)

6–14 tablets per week

239.7

233

1.04 (0.86–1.25)

1.06 (0.88–1.28)

⩾15 tablets per week

65.6

65

1.58 (1.19–2.09)

1.55 (1.17–2.06)

  1. Abbreviations: P-Y=person–years; RRs=relative risks; CI=confidence intervals.
  2. Current users reported a minimum of 1 tablet per week or 1 day per week of regular aspirin use over the previous 2 years; past users qualified as a current user sometime during cohort follow-up; never users never qualified as a current user.
  3. bP-Y of follow-up, in thousands, from 1980–2004.
  4. cRRs adjusted for age.
  5. d95% CI.
  6. eRR adjusted for age, smoking status, age at start of smoking, years since quit smoking (past smokers), and cigarettes per day (current smokers).
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