Implementing Germ Defence digital behaviour change intervention via all primary care practices in England to reduce respiratory infections during the COVID-19 pandemic: an efficient cluster randomised controlled trial using the OpenSAFELY platform

Table 3 Practice engagement

Usage level	Number of practices	% participating practices	% of total intervention group
None	1777	-	61.9
Low	781	71.5	27.2
Medium	204	18.7	7.1
High	108	9.9	3.8

Usage levels: none 0 user, low 0.01 to 0.99% of list, medium 1.00 to 10.99% of users, high 11 to 100% of users

ISSN: 1748-5908