Table 1a.

Interrupted time series segmented regression analysis of rate of prescribing in the UK in 12–19-year-olds, 2000–2006

	Segmented regression models*
	SSRIs§			Fluoxetine			Tricyclics
	Coefficient	Robust SE	P	Coefficient	Robust SE	P	Coefficient	Robust SE	P
Base level (β0)	612.881	28.734	<0.001	377.593	36.582	<0.001	346.963	25.493	<0.001
Base trend (β1)	26.267	2.899	<0.001	16.079	3.482	<0.001	3.756	3.617	0.310
Post-warning change in level (β2)‡	−400.233	43.590	<0.001	−92.542	42.629	0.041	−57.447	42.265	0.187
Post-warning change in trend (β3)‡	−45.344	6.984	<0.001	−21.062	5.922	0.002	−11.960	4.347	0.011