Table 3.

Negative binomial regression models for NMSC and MSC cancers by month of diagnosis.

Month	NMSC (C44)				MSC (C43)
	IRR	95% CI		p	IRR	95% CI		p
January	1.00	0.92	1.09	0.99	1.22	0.95	1.58	0.12
February	1.12	1.03	1.22	0.007	1.22	0.95	1.58	0.12
March	1.18	1.09	1.28	<0.001	1.31	1.02	1.68	0.04
April	1.01	0.93	1.10	0.81	1.21	0.94	1.57	0.14
May	1.25	1.15	1.36	<0.001	1.38	1.08	1.77	0.01
June	1.21	1.12	1.31	<0.001	1.50	1.18	1.92	0.001
July	1.29	1.19	1.40	<0.001	1.76	1.39	2.23	<0.001
August	0.86	0.79	0.94	0.001	1.11	0.86	1.44	0.43
September	1.34	1.23	1.45	<0.001	1.55	1.21	1.97	<0.001
October	1.58	1.46	1.70	<0.001	1.55	1.21	1.97	<0.001
November	1.43	1.32	1.54	<0.001	1.40	1.09	1.79	0.008
Decembera	Ref.				Ref.
Gender
Males	Ref.				Ref.
Females	0.66	0.64	0.68	<0.001	0.94	0.86	1.03	0.21

^aReference category is the month with the lowest incidence.