Table 4.

Factors affecting the scope of QI activities: results of stepwise selection

	β	S.E.	p-value
Scope of QI activities of competitors in the previous period	0.82	0.04	<.0001
Turnover rate of beds in the previous period	−0.04	0.02	0.0136
Period 1	1.18	0.31	<.0001
Period 2	3.11	0.42	<.0001
Period 3	4.21	0.73	<.0001