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

Cancer Communications

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

Model	DF	Males		Females
Model	DF	Dev	P value^a	Dev	P value^a
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 effect^b	3	12.5	0.007	26.2	<0.001
Cohort curvature effect^b	12	26.9	0.003	32.5	0.002

DF degree of freedom, Dev deviance.
^a P value was from a Chi square test of the goodness-of-fit of the model.
^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).

ISSN: 2523-3548