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Table 4 Comparison of age–period–cohort models for lung cancer incidences with Poisson regression in Sihui

From: Secular trend analysis of lung cancer incidence in Sihui city, China between 1987 and 2011

Model DF Males Females
Dev P valuea Dev P valuea
Age 40 244.5 <0.001 187.3 <0.001
Age–period 36 56.7 0.008 56.6 0.048
Age–cohort 27 42.3 0.047 50.3 0.009
Age–period–cohort 24 29.8 0.252 24.1 0.562
Period curvature effectb 3 12.5 0.007 26.2 <0.001
Cohort curvature effectb 12 26.9 0.003 32.5 0.002
  1. DF degree of freedom, Dev deviance.
  2. a P value was from a Chi square test of the goodness-of-fit of the model.
  3. bEffects were assessed by comparing the age–period–cohort model with the age-cohort model (period curvature effect) and the age–period–cohort model with the age-period model (cohort curvature effect).