Table 5.

Effects on length of stay; relevant regression coefficients (RC) and covariance with the managed care group (COV, whether this coefficient is positive or negative) for each variable per DRG.

DRG	Diagnosis/ Procedure	HMO patients per physician		HMO patients per hospital		number of insurers per physician	number of insurers per hospital	number of hospitals per physician
		RC	COV	RC	COV	COV	COV	COV
88	Chronic Obstructive Pulmonary Disease	-0.22	pos	0.48	neg**	pos	neg	pos*
127	Congestive Heart Failure	0.03	pos**	0.46	neg	pos	pos	pos
209	Hip replacement	-0.97**	neg**	-1.60**	neg**	pos**	neg	pos**
358	Hysterectomy with complications	-0.25**	neg	-0.25	pos	pos*	pos	pos*
359	Hysterectomy without complications	-0.08	neg**	0.49*	neg	pos**	pos	pos
370	Cesarean section with complications	-0.29*	pos*	0.78	pos*	pos	pos**	neg**
371	Cesarean section without complications	-0.08**	neg	0.59*	pos	pos**	pos*	neg

*p < 0.1 **p < 0.05