Table 4

Personal characteristics and preferences: comparing principals with sessional GPs.

	Principals		Sessional GPs

Explanatory variables	Regression coefficient	Standard error	Regression coefficient	Standard error
Consultation length	0.490^a	0.049	0.270^a	0.017
Consultation length × female	0.081^a	0.023	-	-
Consultation length × age	−0.005^a	0.001	-	-
Change in hours of work per week	−0.307^a	0.046	−0.235^a	0.048
Change in hours per week × female	−0.044^b	0.018	-	-
Change in hours per week × age	0.004^a	0.001	0.003^b	0.001
Change in hours per week × married	0.055^a	0.021	0.047^c	0.026
Change in annual earnings	0.048^a	0.005	0.044^a	0.007
Change in annual earnings × female	−0.039^a	0.008	-	-
Some outside commitments^d	0.221^a	0.083	−0.057	0.096
Some outside commitments^d × female	0.370^a	0.139	-	-
Out-of-hours work (medium intensity)^e	−3.031^a	0.363	−1.756^a	0.122
Out-of-hours work (medium intensity)^e × female	−0.744^a	0.188	-	-
Out-of-hours work (medium intensity)^e × age	0.024^a	0.007	-	-
Out-of-hours work (medium intensity)^e × out-of-hours work	0.363^a	0.122	-	-
Out-of-hours work (high intensity)^e	−5.99^a	0.602	−3.820^a	0.594
Out-of-hours work (high intensity)^e × female	−0.479^b	0.200	−0.689^a	0.232
Out-of-hours work (high intensity)^e × age	0.053^a	0.011	0.023^c	0.012
Out-of-hours work (high intensity)^e × out-of-hours work	0.488^b	0.200	-	-
Some involvement in practice decisions^f	−0.387^a	0.082	−0.402^a	0.140
Extensive involvement in practice decisions^f	0.322^a	0.088	−0.109	0.142-
Extensive involvement^f × female	0.562^a	0.156	-	-
Further professional development/training^g	0.722^a	0.068	0.510^a	0.102
Constant	−1.090^a	0.094	−1.377^a	0.153
ρ	0.216^a	0.030	0.161^a	0.050
Log likelihood	−1804.3		−742.8
Number of individuals	855		356
Number of observations	5098		2128
Wald χ² (23)	951.0^a		-
Wald χ² (13)			390.2^a

Notes: Interaction terms indicate how the valuation of each attribute differs according to age, female relative to male, married relative to single and currently active in out-of-hours service relative to currently inactive in out-of-hours service.
↵^a= P values ≤0.01
↵^b= 0.01 <P values ≤0.05
↵^c= 0.05 <P ≤0.10
↵^drelative to no outside commitments
↵^erelative to no out-of-hours on-call commitments
↵^frelative to no involvement in practice decisions
↵^grelative to not enough continuing professional development/training.