Table 4.

Multiple ITSA for Laspeyres Price Indices of high-in and reformulated products that C2C3 households purchased

C2C3	High-in	Reformulated high-in	Reformulated not high-in
Control preintervention trend (${\mathrm{\beta }}_1$)	0.0048***	0.0048***	0.0048***
	(0.0006)†	(0.0005)	(0.0005)
Change in level control postintervention (${\mathrm{\beta }}_2$)	0.0190	0.0228**	0.0184*
	(0.0117)	(0.0099)	(0.0107)
Change in trend control postintervention (${\mathrm{\beta }}_3$)	−0.0024***	−0.0025***	−0.0024***
	(0.0006)	(0.0007)	(0.0006)
Preintervention difference in level between treated and control (${\mathrm{\beta }}_4$)	0.0084	0.0083	0.0038
	(0.0121)	(0.0125)	(0.0104)
Preintervention difference in trend between treated and control (${\mathrm{\beta }}_5$)	−0.0012	−0.0009	−0.0006
	(0.0009)	(0.0011)	(0.0008)
Difference in change in level treated vs control postintervention (${\mathrm{\beta }}_6$)	−0.0114	0.0026	−0.0117
	(0.0202)	(0.0274)	(0.0198)
Difference in change in trend treated vs control postintervention (${\mathrm{\beta }}_7$)	0.0017	0.0016	0.0034*
	(0.0013)	(0.0019)	(0.0017)

*p<0.1, **p<0.05, ***p<0.01.

^†SEs are in parentheses.

ITSA, interrupted time series analysis.