Table 7:

Linear regression model parameters including regression coefficients, their confidence intervals, P values, and Wald statistic values

Parameter	Coefficient (b)	Confidence Interval	Standard Error	P Value	Wald Statistic
Intercept	−1081.1	[−1403.4, −0.7587]	163.5	<.0001	43.7
Age at procedure	18.6	[3.1, 34.0]	7.8	.018	5.6
Procedure type	454.9	[261.7, 648.2]	98.0	<.0001	21.5
No procedures	555.5	[487.7, 623.3]	34.4	<.0001	260.9