Table 3 Association between exposure of the home address to locally generated primary PM₁₀ and incident cough and wheeze (defined as not present in the 1998 survey and present in the 2001 survey versus no symptoms in both surveys).

	Unadjusted			Adjusted*
	OR†	95% CI	n‡	OR†	95% CI	n‡
Cough without a cold	1.68	1.39 to 2.03	1479	1.62	1.31 to 2.00	1287
Night time cough	1.21	1.00 to 1.46	1382	1.19	0.96 to 1.47	1191
Wheeze	1.22	0.92 to 1.62	1533	1.42	1.02 to 1.97	1319

OR, odds ratio; CI, confidence interval.

*Adjusted for confounding variables in table 1.

†Per μg/m³ increase in locally generated primary PM₁₀.

‡Number of responses.