Association between environmental exposures and granulomatosis with polyangiitis in Canterbury, New Zealand

Table 2 Demographics of the patients with GPA and controls^a

	GPA	COPD index	COPD interview	OA index	OA interview
	(n = 49)	(n = 49)	(n = 49)	(n = 49)	(n = 49)
Age at interview (years)	64.9 (33–89)		65.1 (33–87)		65.1 (31–87)
Age at index date (years)	53.3 (20–81)	54.3 (23–83)		53.6 (22–81)
Male	26 (53.1 %)	26 (53.1 %)	26 (53.1 %)	26 (53.1 %)	26 (53.1 %)
NZ European/European	45 (91.8 %)	46 (93.9 %)	46 (93.9 %)	48 (97.9 %)	46 (93.9 %)
NZ Maori	4 (8.2 %)	3 (6.1 %)	3 (6.1 %)	1 (2 %)	3 (6.1 %)
Ever smoker	28 (57.1 %)	38 (77.6 %)	44 (89.8 %)	25 (51.0 %)	23 (46.9 %)

Data presented as mean (range) or number (%)
^aThe column headed GPA describes the cases, while the columns headed COPD and OA describe the two sets of disease control. Disease controls were further divided into those age-matched ±5 years for age at onset of disease (index) and those matched for age at year of interview (interview)
COPD chronic obstructive pulmonary disease, GPA granulomatosis with polyangiitis, NZ New Zealand, OA osteoarthritis

ISSN: 1478-6362