Table 7.

Inter-center comparison of length of noninvasive ventilation analyzed by opioid exposure categories (N = 87).

Adjusting for center
Variable	Exponentiated estimate	95% confidence limits		p-value
High vs. low cumulative opioid dose	0.60	0.38	0.94	0.027
Center 2 vs. Center 1	1.35	0.87	2.1	0.177
Center 3 vs. Center 1	1.24	0.72	2.13	0.437
Center 3 vs. Center 2	0.91	0.54	1.55	0.74
Adjusting for center and EEG-confirmed seizure
Variable	Exponentiated estimate	95% confidence limits		p-value
High vs. low cumulative opioid dose	0.68	0.45	1.04	0.077
Center 2 vs. Center 1	1.41	0.94	2.11	0.1
Center 3 vs. Center 1	1.07	0.65	1.77	0.784
Center 3 vs. Center 2	0.76	0.46	1.25	0.285
EEG-confirmed seizure	2.29	1.54	3.4	<.0001