Table 2.

Standard Poisson regression for all data (both hemispheres)

	Rate ratio	95% CI (lower)	95% CI (upper)	p Value
(Intercept)	10.17	7.66	13.22	<0.001
Season (ref=summer)
Autumn	0.92	0.82	1.04	0.179
Spring	0.96	0.85	1.08	0.478
Winter	0.93	0.82	1.04	0.200
Gender (ref=female)
Male	0.45	0.41	0.49	<0.001
Age (ref=40–59)
60–69	6.93	5.28	9.26	<0.001
70–79	18.45	14.24	24.41	<0.001
80+	13.34	10.27	17.70	<0.001

The number of giant cell arteritis cases is modelled as a function of age, gender and season.

Ref, reference category.