Table 3.

Negative Binomial Regression using Multilevel Modeling on Number of Psychotherapy Sessions Attended for Patients Diagnosed with PTSD in Mental Health or Primary/Other Care Clinics (Patients nested within site as random effect)

Variable	Incident Rate Ratio	95% CI	p value
Mental Health Care	4.25	3.75 – 4.81	<.0001
Age	0.99	0.96 – 1.02	0.60
Female	1.36	1.24 – 1.49	<.0001
Dyslipidemia	1.04	0.93 – 1.17	0.50
Hypertension	1.00	0.89 – 1.12	0.90
Anxiety	1.31	1.20 – 1.42	<.0001
Depression	1.31	1.20 – 1.43	<.0001
Substance Use Disorder	0.98	0.88 – 1.09	0.70
Bipolar disorder	1.31	1.16 – 1.49	<.0001

Note: Reference group is patients diagnosed with PTSD in primary/other care. The intraclass correlation coefficient for the effect of site was ICC = 0.31.