Table 4 Correlations at individual level (to the left of the diagonal) and unit level (to the right of the diagonal), corrected for occupation type, years of work at unit and hours a week of work at the unit

	Dimension	1	2	3	4	5	6	7	8	9	10	11
1	Feedback about and learning from error	•	0.401	–	0.629	0.415	0.445	–	0.306	0.298	–0.041 NS	–
2	Overall perceptions of safety	0.386	•	–	0.158 NS	0.100 NS	0.194	–	0.135 NS	0.067 NS	0.631	–
3	Teamwork across hospital units	0.289	0.326	•	–	–	–	–	–	–	–	–
4	Frequency of event reporting	0.357	0.239	0.146	•	−0.076 NS	−0.032 NS	−	0.600	−0.020 NS	−0.290	–
5	Supervisor/manager expectations and actions	0.429	0.321	0.210	0.165	•	0.324	–	0.053 NS	0.322	0.213	–
6	Teamwork within units	0.325	0.277	0.202	0.196	0.314	•	–	−0.020 NS	0.597	−0.042 NS	–
7	Non-punitive response to error	0.272	0.362	0.198	0.162	0.293	0.261	•	–	–	–	–
8	Smooth transitions	0.219	0.302	0.439	0.172	0.155	0.199	0.206	•	0.216 NS	−0.149 NS	–
9	Openness of communication	0.426	0.298	0.210	0.191	0.393	0.323	0.352	0.229	•	−0.130 NS	–
10	Adequate staffing	0.140	0.300	0.138	0.045	0.260	0.176	0.242	0.135	0.208	•	–
11	Hospital management support	0.420	0.371	0.375	0.224	0.306	0.180	0.212	0.221	0.246	0.188

All correlations were significant at p<0.05, except for those specified with NS (not significant). There was not enough information to obtain estimates at unit level for Teamwork across hospital units, Non-punitive response to error and Hospital management support.