Table 7.

Internal consistency by test of Cronbach’s α

	Dimension	Total sample	Hospital care sample	Primary care sample
1	Communication openness	0.68	0.67	0.70
2	Feedback and communication about error	0.76	0.76	0.80
3	Frequency of error reporting	0.87	0.87	0.88
4	Handoffs and transitions between units and shifts	0.74	0.75	0.73
5	Executive management support for patient safety	0.81	0.81	0.79
6	Nonpunitive response to error	0.74	0.74	0.75
7	Organizational learning–continuous improvement	0.66	0.66	0.68
8	Overall perceptions of safety	0.71	0.72	0.69
9	Staffing	0.67	0.67	0.64
10	Supervisor/manager expectations and actions promoting safety	0.78	0.79	0.79
11	Teamwork across units	0.72	0.71	0.74
12	Teamwork within the unit	0.76	0.75	0.80
13	Information and support to patients and family who have suffered an adverse event	0.83	0.83	0.84
14	Information and support to staff who have been involved in an adverse event	0.77	0.77	0.81

Criterion ≥0.7 for each dimension.