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Table 4

Standardized incidence ratios (SIRs) for pancreatic cancer in members of kindreds with at least one first-degree relative with pancreatic cancer by smoking status and age

No. of individualsaPerson-years of follow-upObserved casesExpected casesSIR (95% CI)b
Smoking status      
 Ever smoker 546 1761 7 0.365 19.2 (7.7–39.5) 
 Never smoker 1214 2941 4 0.640 6.25 (1.70–16.0) 
 Unknown 233 572 0 0.214 0 (0–17.3) 
Age      
 <45 738 1739 0 0.020 0 (0–615) 
 45–64.9 833 2033 4 0.253 15.8 (4.31–40.4) 
 ≥65 620 1502 7 0.947 7.4 (2.97–15.2) 
No. of individualsaPerson-years of follow-upObserved casesExpected casesSIR (95% CI)b
Smoking status      
 Ever smoker 546 1761 7 0.365 19.2 (7.7–39.5) 
 Never smoker 1214 2941 4 0.640 6.25 (1.70–16.0) 
 Unknown 233 572 0 0.214 0 (0–17.3) 
Age      
 <45 738 1739 0 0.020 0 (0–615) 
 45–64.9 833 2033 4 0.253 15.8 (4.31–40.4) 
 ≥65 620 1502 7 0.947 7.4 (2.97–15.2) 
a

Because of changes in age strata during follow-up, numbers do not equal total number of individuals in study.

b

CI, confidence interval.

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