Table 2.

Geographical variation in PBC pathology-based prevalence, by sex

	IRR (95% CI)		Test for difference
	Males	Females
State
QLD	1.00 [reference]	1.00 [reference]
NSW/ACT	0.91 (0.59, 1.42)	1.11 (0.95, 1.31)	P = 0.44
SA	1.26 (0.81, 1.96)	1.87 (1.60, 2.19)	P = 0.16
VIC	1.65 (0.99, 2.76)	1.76 (1.44, 2.15)	P = 0.68
TAS	1.91 (0.84, 4.34)	2.79 (2.12, 3.66)	P = 0.45
Trend:	P = 0.010	P < 0.001	P = 0.82
Region type
Regional	1.00 [reference]	1.00 [reference]
Metro	1.48 (1.03, 2.13)	1.28 (1.13, 1.45)	P = 0.45
Capital	1.48 (1.04, 2.09)	1.01 (0.89, 1.14)	P = 0.043
Trend:	P = 0.019	P = 0.44	P = 0.054
Latitude (continuous)	1.01 (0.98, 1.05) P = 0.46	1.05 (1.04, 1.06) P < 0.001	P = 0.13
Latitude (quintiles)
−18.02, −27.59	1.00 [reference]	1.00 [reference]
<-27.59, −33.85	0.68 (0.40, 1.14)	1.15 (0.96, 1.37)	P = 0.070
<-33.85, −35.33	1.00 (0.64, 1.55)	1.09 (0.92, 1.31)	P = 0.93
<-35.33, −37.75	1.01 (0.57, 1.79)	1.29 (1.06, 1.58)	P = 0.22
<-37.75, −42.72	0.99 (0.63, 1.55)	1.86 (1.58, 2.19)	P = 0.031
Trend:	P = 0.64	P < 0.001	P = 0.057

Analyses by Poisson regression, estimating an IRR (95% CI). All models except region type adjusted for region type.

Bold indicates statistical significance.