Table 2.

Mouth cancer in Mumbai 1995–2009, men aged 25–74. Analysis of deviance for nested APC models.

Model No.	Model description	Goodness-of-fit			Model Comparison	Effect Tested	Difference between models
		dfa	Residual Deviance	p			dfa	Deviance	p
0	Age	9	149.8	<0.0001
1	Age + drift	10	122.3	<0.0001	1 vs. 0	Drift	1	27.5	<0.0001
2	Age + period	11	118.8	<0.0001	2 vs.1	Non-linear period	1	3.5	0.0080
3	Age + cohort	20	107.7	<0.0001	3 vs.1	Non-linear cohort	10	14.6	0.0012
4	Age+ period + cohortb	21	103.2	<0.0001	4 vs. 3	Non-linear periodc	1	4.5	0.002
					4 vs.2	Non-linear cohortc	10	15.6	0.0005

^aDegrees of freedom.

^bBest-fitting APC model on the grounds of significant non-linear period and cohort effects.

^cPeriod (cohort) adjusted for non-linear cohort (period).