Table 6. Unconditional logistic regression analysis of asthma and both long-term (up to 30-years) and current H₂S exposure metrics in Rotorua city residents, 2008–2010, limited to participants with satisfactory pre- and post-bronchodilator measurements (N = 1,098).

H 2 S exposure quartile a	Time-weighted mean exposure				Maximum exposure at work, home, or school
	Asthma cases (%)	Non-cases (%)	OR	95% CI	Asthma cases (%)	Non-cases (%)	OR	95% CI
Long-term (30 years) exposure b
1 (Reference)	113 (40.2)	168 (59.8)	1.00	-	101 (37.1)	171 (62.9)	1.00	-
2	100 (35.0)	186 (65.0)	0.82	0.58, 1.17	102 (36.7)	176 (63.3)	0.97	0.67, 1.39
3	90 (33.5)	179 (66.5)	0.76	0.51, 1.27	96 (33.2)	193 (66.8)	0.92	0.64, 1.33
4	81 (30.9)	181 (69.1)	0.76	0.52, 1.11	85 (32.8)	174 (67.2)	1.00	0.68, 1.47
Current exposure c
1 (Reference)	116 (43.6)	150 (53.4)	1.00	-	114 (43.2)	150 (56.8)	1.00	-
2	85 (29.9)	199 (70.1)	0.58	0.40, 0.84	89 (32.8)	182 (67.2)	0.69	0.48, 1.00
3	97 (34.6)	183 (65.4)	0.75	0.52, 1.07	92 (31.3)	202 (68.7)	0.66	0.46, 0.95
4	86 (32.1)	182 (67.9)	0.66	0.46, 0.95	89 (33.1)	180 (66.9)	0.68	0.47, 0.99
TOTAL	384 (35.0)	714 (65.0)			384 (35.0)	714 (65.0)

a Adjusted for sex, age-group, ethnicity, education, income, smoking status.

b For H₂S exposure concentrations, see Table 2.

c For H₂S exposure concentrations, see Table 3.