The discriminative power of patient experience surveys

de Boer, Dolf; Delnoij, Diana; Rademakers, Jany

doi:10.1186/1472-6963-11-332

BMC Health Services Research

Table 3 The discriminative power of patient experience surveys for different patient groups and quality aspects in unadjusted and adjusted models, accompanied by the sample sizes required to detect differences between providers reliably.

From: The discriminative power of patient experience surveys

	Empty model			Adjusted model
									95% expected range of provider scores			Required sample size per provider		Required number of patients to be approached per provider^c
	Variance providers^a	Variance individuals^b	ICC	Variance providers^a	Variance individuals^b	ICC	Mean	SD providers	lower limit	upper limit	range	reliability = .70	reliability = .80	reliability = .70	reliability = .80
Doctor's communication
Hip or knee surgery (n1 = 43; n2 = 1462)^c	0.0133	0.2955	0.043	0.0100	0.2818	0.034	3.44	0.10	3.24	3.64	0.40	65	112	87	150
Varicose veins (n1 = 20; n2 = 2189)	0.0049	0.2118	0.023	0.0041	0.2040	0.020	3.62	0.06	3.49	3.75	0.26	117	200	190	325
Cataract surgery (n1 = 55; n2 = 4021)	0.0035	0.1943	0.017	0.0033	0.1913	0.017	3.58	0.06	3.46	3.70	0.23	134	230	187	321
Spinal disc herniation (n1 = 20; n2 = 1574)	0.0025	0.4125	0.006	0.0015	0.4020	0.004	3.52	0.04	3.44	3.60	0.16	614	1053	1452	2489
Change in physical functioning
Hip or knee surgery (n1 = 43; n2 = 1345)	0.0046	0.3168	0.014	0.0038	0.3105	0.012	2.50	0.06	2.38	2.63	0.24	193	331	258	442
Varicose veins (n1 = 20; n2 = 1663)	0.0047	0.2117	0.022	0.0044	0.2100	0.020	2.46	0.07	2.32	2.59	0.26	112	192	181	310
Cataract surgery (n1 = 55; n2 = 2982)	0.0003	0.1675	0.002	0.0002	0.1653	0.001	2.56	0.01	2.54	2.59	0.05	2516	4313	3494	5990
Spinal disc herniation (n1 = 20; n2 = 1592)	0.0022	0.2720	0.008	0.0010	0.2560	0.004	2.43	0.03	2.37	2.49	0.13	569	975	1355	2322
Global rating
Hip or knee surgery (n1 = 43; n2 = 1496)	0.0332	1.8371	0.018	0.0215	1.7036	0.012	8.36	0.15	8.07	8.65	0.59	185	317	247	423
Varicose veins (n1 = 20; n2 = 2169)	0.0952	1.7139	0.053	0.0915	1.6076	0.054	7.92	0.30	7.32	8.52	1.21	41	70	67	114
Cataract surgery (n1 = 55; n2 = 3967)	0.0417	1.7341	0.023	0.0396	1.6791	0.023	7.75	0.20	7.35	8.15	0.80	99	169	138	236
Spinal disc herniation (n1 = 20; n2 = 1590)	0.0486	2.4523	0.019	0.0450	2.3155	0.019	7.42	0.21	7.00	7.84	0.85	120	206	284	487
Recommendation to others
Hip or knee surgery (n1 = 43; n2 = 1497)	0.0076	0.3556	0.021	0.0063	0.3424	0.018	3.58	0.08	3.42	3.74	0.32	126	217	168	289
Varicose veins (n1 = 20; n2 = 2154)	0.0182	0.3900	0.045	0.0170	0.3738	0.043	3.34	0.13	3.08	3.60	0.52	51	88	84	143
Cataract surgery (n1 = 55; n2 = 4003)	0.0111	0.3055	0.035	0.0108	0.3008	0.035	3.41	0.10	3.20	3.62	0.41	65	112	91	156
Spinal disc herniation (n1 = 20; n2 = 1564)	0.0160	0.5157	0.030	0.0146	0.4986	0.028	3.16	0.12	2.92	3.40	0.48	80	137	188	323

^a Variances in bold are significant (p < .05)
^b The significance of variances at the level of individuals is not reported
^c Derived from the required sample size and the response rate (hip or knee surgery (75%), varicose veins (62%), cataract surgery (72%), spinal disc herniation (42%))
^d n1 denotes the number of healthcare providers, n2 denotes the total number of patients

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ISSN: 1472-6963

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