Table 6.

Association between initial intervention used to suppress the fire and probability of fire growth between initial assessment and being held.

Contrast	Risk difference	95% confidence interval	Adjusted p-value
Air tanker vs HAC1H	0.107	(0.083, 0.131)	<0.001
Ground-based action vs HAC1H	−0.031	(−0.056, −0.005)	0.121
HAC1F vs HAC1H	−0.008	(−0.031, 0.015)	1.000
HAC1R vs HAC1H	−0.005	(−0.032, 0.022)	1.000
Ground-based action vs Air Tanker	−0.138	(−0.170, −0.105)	<0.001
HAC1F vs Air Tanker	−0.115	(−0.145, −0.085)	<0.001
HAC1R vs Air Tanker	−0.112	(−0.145, −0.079)	<0.001
HAC1F vs Ground-based action	0.023	(−0.009, 0.055)	0.749
HAC1R vs Ground-based action	0.026	(−0.009, 0.061)	0.749
HAC1R vs HAC1F	0.003	(−0.030, 0.036)	1.000

Notes: All estimates are adjusted using the augmented overlap weights estimator for Initial Spread Index, Fire Weather Index, year, how the fire was discovered, ecological region, fuel type, period of day, month of the year, response time, number of fires active, and ln of the size of the fire at the time of the initial attack. Abbreviations: HAC1H = heli-attack crew with helicopter but no rappel capability, HAC1R = heli-attack crew with helicopter and rappel capability, HAC1F = fire-attack crew with or without a helicopter and no rappel capability. P-values are adjusted for multiple comparisons using the Holm method.