Table 3.

Multiple ITSA for Laspeyres Price Indices of high-in and reformulated products that ABC1 households purchased

ABC1	High-in	Reformulated high-in	Reformulated not high-in
Control preintervention trend (${\mathrm{\beta }}_1$)	0.0038***	0.0037***	0.0038***
	(0.0007)†	(0.0008)	(0.0007)
Change in level control postintervention (${\mathrm{\beta }}_2$)	0.0493***	0.0521***	0.0498**
	(0.0184)	(0.0192)	(0.0200)
Change in trend control postintervention (${\mathrm{\beta }}_3$)	−0.0019*	−0.0020**	−0.0020*
	(0.0010)	(0.0009)	(0.0011)
Preintervention difference in level between treated and control (${\mathrm{\beta }}_4$)	0.0129	0.0110	0.0039
	(0.0133)	(0.0162)	(0.0125)
Preintervention difference in trend between treated and control (${\mathrm{\beta }}_5$)	−0.0011	.0001	−0.0006
	(0.0010)	(0.0012)	(0.0011)
Difference in change in level treated vs control postintervention (${\mathrm{\beta }}_6$)	0.0021	−0.0164	0.0106
	(0.0261)	(0.0302)	(0.0316)
Difference in change in trend treated vs controls postintervention (${\mathrm{\beta }}_7$)	−0.0001	0.0005	0.0027
	(0.0014)	(0.0019)	(0.0025)

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

^†SEs are in parentheses.

ITSA, interrupted time series analysis.