Table V:

Multivariable Models for Exacerbations in Self-Identified Blacks and Non-Hispanic Whites.

Significant exacerbation Predictors	All Blacks (n=450)a		All non-Hispanic Whites (n=1108)a
	RR (95% CI)	P-value	RR (95% CI)	P-value
Exacerbation history		0.053		<0.001
≥2 vs 0	2.1 (1.10–3.84)	0.024	2.5 (1.45–4.18)	<0.001
1 vs 0	1.7 (0.92–3.03)	0.091	1.8 (1.20–2.84)	0.005
Sex (Females versus Males)	1.1 (0.63–1.83)	0.79	0.7 (0.47–1.01)	0.054
% predicted FEV1, per 14% increase	0.7 (0.54–0.95)	0.022	0.8 (0.62–0.93)	0.008

Relative rates (RR) for continuous variables expressed per change by one standard deviation. Models include median percentage African genetic ancestry (AA) which varied between race dues to marked differences in distribution of Native American, European, and African ancestries. Models also include protocol, age, sex, FEV1, race, and exacerbation history.

^aPoisson regression, repeated measures.