Impact of the COVID-19 pandemic on alcohol or drug use symptoms and service need among youth: a cross-sectional sample from British Columbia, Canada

Table 3 Parameter estimates, standard errors and p-values from interrupted time series model predicting average monthly substance use symptoms per youth over time

	Coefficient	Standard error	Z-Score	p-value
Intercept	1.102	0.101	10.89	< 0.001
Pre-pandemic trend	0.006	0.007	0.88	0.384
Level change immediately after the pandemic	0.770	0.286	2.69	0.01
Trend change after the pandemic	−0.012	0.010	−1.19	0.242

ISSN: 1747-597X