Predictor	Estimated coefficient	Standard error
Intercept	7.85	0.31
Number of days worked	1.64	0.10
Main interviews	1.38	0.04
Screening interviews	0.24	0.02
Main contact	-0.07	0.02
Screening contact	0.11	0.03
Main no contact	0.15	0.01
Screening no contact	0.06	0.00
Nonsample	0.25	0.03
Number of segments visited	0.75	0.05