Table 1.

Main effects and smoothing terms from PAM-stratified hazards model. Effective degrees of freedom (EDF) for the spline representing each covariate; an EDF of 1 represents a linear relationship, while an EDF of greater than 2 represents a highly nonlinear relationship.

	estimate	s.e.	z-value	p-value
intercept	−4.19	0.12	−34.22	<0.001
sex[male]	0.49	0.16	3.15	0.002
	effective degrees of freedom	chi-square value	p-value
male	3.10	89.5	<0.001
female	1.00	133.4	<0.001