Table 5.

Association between Vascular Pruning and Prospective Asthma Exacerbation Rate

	Incidence Rate Ratio for Asthma Exacerbations during Follow-up	Confidence Interval	P Value
BV5/TBV (low vs. high)	1.45	1.00 to 2.11	0.049
BV10/TBV (low vs. high)	1.45	1.02 to 2.06	0.036

For definition of abbreviations, see Table 4.

BV5/TBV and BV10/TBV dichotomized at 25th percentile. That is, effect estimates are expressed as the rate of those with the most pruning (top 25%) vs. those with less pruning (bottom 75%).

All models were adjusted for baseline values of age, sex, race, body mass index, prebronchodilator FEV₁ percent predicted, and asthma control test score as well as for a reported history of exacerbation in the year before the baseline visit.

n with longitudinal data available = 214. n who reported exacerbation during follow-up = 87 (40.7%).