Table 2.

Risk estimates for non-Hodgkin's lymphoma associated with cigarette smoking by study

StudyNonsmoker,* controls/cases (n)Ever smoker, controls/cases (n)OR (95% CI)
Nebraska226/173218/1560.92 (0.69-1.23)
NCI Surveillance, Epidemiology and End Results186/224226/2590.97 (0.74-1.27)
USC181/183197/1950.98 (0.73-1.31)
Connecticut323/270395/3311.00 (0.81-1.25)
United Kingdom367/273552/4411.04 (0.85-1.28)
NSW333/329361/3751.06 (0.85-1.31)
Northern Italy469/174687/2551.07 (0.82-1.39)
UCSF1,014/5271,388/7761.07 (0.92-1.23)
Italy815/676954/9771.21 (1.03-1.41)
Pooled data set3,914/2,8294,978/3,7651.07 (1.00-1.15)§
  • * Reference group is defined as participants who smoked 100 cigarettes in their lifetime or smoked for 6 months.

  • ORs and 95% CIs were estimated using unconditional logistic regression models, adjusted for age, sex, and race.

  • Adjusted for study center or geographic region of data collection.

  • § Joint fixed-effects logistic regression model; also adjusted for study center.