Billing by residents and attending physicians in family medicine: the effects of the provider, patient, and visit factors

Table 3 Stratified analysis

Characteristic	Odds ratio	p-value	N
By patients’ age
Patient age > =55	0.48	(0.02)**	30,193
Patients age 18–55	0.55	(0.01)**	56,448
Patients <=18	0.83	(0.06)	15,196
By number of diagnoses
One diagnosis	0.55	(0.03)**	32,567
Two diagnoses	0.38	(0.01)**	27,750
Three diagnoses	0.73	(0.03)**	17,598
Four diagnoses or more	0.52	(0.02)**	20,686
By resident’s gender
Male	0.44	(0.01)**	56,917^a
Females	0.59	(0.01)**	65,989^a

ISSN: 1472-6920