Table 2

Country/region of birth of patients treated for pterygyium in Western Australia (WA) compared with the State distribution. Bolded regions show groups with higher than expected reprentations in the pterygium cohort

Geographic region	Pterygium cases	%	WA pop.	%	p	95% CI
Australia and New Zealand	17 460	73.9	1 647 880	70.0	<0.001	3.3	4.5
Northern European	2438	10.3	3 10 820	13.2	<0.001	2.5	3.3
Southern European	598	2.5	66 050	2.8	0.001	0.1	0.5
Southeast Asia	636	2.7	1 10 520	4.7	<0.001	1.8	2.2
Northeast Asia	136	0.6	37 680	1.6	<0.001	0.9	1.1
South and Central Asia	144	0.6	52 050	2.2	<0.001	1.5	1.7
North Africa or Middle Eastern	454	1.9	21 870	0.9	<0.001	0.8	1.2
Sub-Saharan Africa	444	1.9	74 830	3.2	<0.001	1.1	1.5
Oceania (excluding Australia/New Zealand)	209	0.9	4670	0.2	<0.001	0.6	0.8
Americas	146	0.6	27 110	1.2	<0.001	0.5	0.7
Unknown/missing	960	4.1	70	0.0
Total	23 625		2 353 480