TABLE 3—

Percentage of Cars With All Children Younger Than 12 Years Seated in the Rear, by Driver Seat Belt Use

	Percentage of Cars
	Preintervention	Postintervention
Holyoke	33	49a,b
Driver belted	36c	49
Driver unbelted	29c	48
Control cities	28	41a,b
Driver belted	32c	43
Driver unbelted	24c	40

Note. Data collectors were able to observe shoulder-belt use only.

^aP < .0001 for change across time periods.

^bP < .0001 differences in the changes in rates between Holyoke and control cities.

^cP < .01 for association between preintervention driver shoulder-belt use and postintervention rear seating.