Table 3. Percentage rates of collapse of large cavity trees by fire category adjusted (standardized) for the duration of each period.

	Time Period
Fire Severity	1997–2006	2006–2009	2009–2010	2010–2011
No Fire	0.64 (63/1129)	6.78 (110/579)	3.62 (17/469)	3.76 (17/452)
Moderate		25.54 (155/264)	0.92 (1/109)	1.85 (2/108)
Severe		12.97 (76/223)	2.72 (4/147)	0.00 (0/143)

Values in parentheses are the numbers of collapsed large cavity trees over the total measured trees for each time period. The first measurement in the 2009–2010 period was in April 2009, two months after the 2009 wildfire. The standardized collapse rate, , was calculated via where is the fraction of trees experiencing collapse during a time period of length .