Figure 3. Multivariable-adjusted HRsa and 95% CIs for BMI (per 5 kg/m2) and thyroid cancer risk, stratified by selected risk factors: aggregate analysis.
Abbreviations: BMI=body mass index, CI= confidence interval, HR= hazards ratio
*Test for interaction calculated using the likelihood ratio test comparing a model with a cross-product term to a model without
**Test for interaction calculated using the Mantel-Haenszel test for heterogeneity
aAdjusted for sex, education, race, marital status, cigarette smoking, alcohol intake, and cohort
bCalculated using a random effects model