Table 6.

Parameter variance estimation in zero model of patient safety grade and number of events reported.

	Estimate	SE	Z	p > |Z|	(95% Conf. Interval)
Patient Safety Grade
Excellent	−2.614	0.177	−14.800	<0.001	−2.960	−2.268
Good	0.152	0.132	1.150	0.250	−1107.000	0.410
Acceptable	3.168	0.211	15.010	<0.001	2.754	3.582
Poor/failing	5.099	0.463	11.020	<0.001	4.192	6.007
Hospital Var(_cons)	0.197	0.109			0.066	0.583
LR test vs. ologit model: chibar2(01) = 11.88, Prob ≥ chibar2 = 0.0003
Number of Events Reported
No events	0.105	0.160	0.650	0.513	−0.209	0.418
1–2 Events	1.583	0.171	9.260	<0.001	1.248	1.918
3–5 Events	3.001	0.212	14.140	<0.001	2.585	3.417
6–10 Events	3.854	0.270	14.270	<0.001	3.325	4.383
>10 Events	5.081	0.435	11.670	<0.001	4.228	5.935
Hospital Var(_cons)	0.336	0.150			0.140	0.806
LR test vs. ologit model: chibar2(01) = 48.51, Prob ≥ chibar2 = 0.0001

Notes: LR test is conservative and provided only for reference; Pro ≥ chibar2 equals to p value.