TABLE 3.

Summary of the Percentage of Variance Accounted for the in the Original Domains by the Reduced Domains Across Item Combinations

	Variance Accounted for in the Original Domain (%)					Site-level Reliability
Domain and Length of Item Subsets	ACO	PCMH	Physician Group: Physician	Physician Group: Practice	Safety Net	ACO	PCMH	Physician Group: Physician	Physician Group: Practice	Safety Net
Provider Communication (original domain)	—	—	—	—	—	0.80	0.80	0.95	0.97	0.87
5 items (Understand, Listen, Information, Medical history, Spend enough time)	99	99	99	99	99	0.80	0.82	0.95	0.97	0.87
4 items (Understand, Listen, Medical history, Spend enough time)	97	98	98	98	96	0.80	0.81	0.95	0.97	0.87
3 items (Understand, Medical history, Spend enough time)	93	94	96	96	91	0.79	0.86	0.95	0.97	0.87
2 items (Understand, Spend enough time)	86	86	92	92	81	0.79	0.87	0.95	0.96	0.85
1 item (Spend enough time)	67	70	80	80	62	0.75	0.81	0.95	0.97	0.84
Access (original domain)	—	—	—	—	—	0.77	0.88	0.95	0.96	0.84
4 items (Urgent care, Routine care, During office hours, Timely)	99	98	99	99	97	0.88	0.92	0.95	0.96	0.89
3 items (Urgent care, Routine care, Timely)	94	94	95	95	91	0.90	0.86	0.94	0.96	0.91
2 items (Routine care, Timely)	88	88	90	90	86	0.94	0.87	0.97	0.98	0.91
1 item (Timely)	66	64	73	73	59	0.96	0.71	0.98	0.99	0.87

Results presented here were selected from the item subset among all possible combinations within a given length that resulted in the highest site-level reliability. The items representing the highest site-level reliability for a given length are provided in parenthesis. Complete item text can be found in Table 2.

ACO indicates Accountable Care Organization; PCMH, patient-centered medical home.