Table 2

Observed (O) and expected (E) cases of severe IVH for 24 NICUs, actual and shrunken estimates of excess cases (O–E), and W scores, adjusted for five predictor variables

			O–E			W score
NICU	O	E	Actual	Shrunken	95% limit	W	95% confidence limits
*Significant at 5% level.
†Lies outside 95% limits.
1	7	15.56	−8.56	−5.51	6.20	−3.54	−6.50, −0.57*
2	15	34.42	−19.42	−15.53†	10.28	−3.89	−6.00, −1.78*
3	14	16.87	−2.87	−1.90	6.55	−1.09	−3.95, 1.77
4	7	6.58	0.42	0.18	3.31	0.33	−3.45, 4.12
5	11	18.13	−7.13	−4.83	6.87	−3.58	−7.41, 0.25
6	12	18.08	−6.08	−4.11	6.86	−2.83	−6.34, 0.69
7	22	25.52	−3.52	−2.63	8.56	−0.98	−3.54, 1.58
8	11	10.42	0.58	0.32	4.68	0.34	−3.09, 3.77
9	21	20.42	0.58	0.41	7.43	0.18	−2.35, 2.70
10	11	10.67	0.33	0.18	4.76	0.21	−3.53, 3.94
11	11	12.27	−1.27	−0.74	5.26	−0.82	−4.86, 3.22
12	26	25.18	0.82	0.61	8.49	0.23	−2.28, 2.73
13	28	29.84	−1.84	−1.43	9.43	−0.47	−3.01, 2.06
14	21	19.92	1.08	0.76	7.31	0.37	−2.44, 3.19
15	23	21.13	1.87	1.32	7.59	0.59	−2.07, 3.26
16	14	11.23	2.77	1.57	4.94	1.51	−1.84, 4.86
17	34	28.49	5.51	4.23	9.16	1.28	−0.97, 3.52
18	12	10.60	1.40	0.77	4.74	0.94	−3.02, 4.91
19	6	3.53	2.47	0.72	1.98	3.34	−1.38, 8.06
20	13	8.24	4.76	2.32	3.93	3.53	−0.37, 7.42
21	14	7.32	6.68	3.07	3.59	4.84	1.21, 8.48*
22	10	5.27	4.73	1.79	2.77	5.37	0.61, 10.14*
23	9	3.33	5.67	1.58	1.89	10.31	4.18, 16.43*
24	18	7.00	11.00	4.93†	3.47	13.09	7.52, 18.66*
Total	370