Unmeasured improvement work: the lack of routinely collected, service-related data in NHS endoscopy units in England involved in

Table 1 Breakdown of the type of endoscopy data collected by each of the eight study sites submitting routinely collected data and the earliest time point with data from that site.

Site type	No. referrals	Activity	No. patients waiting	No. lost slots	Earliest time period with data
Intervention	No	Yes	Yes	No	Jan-03
	No	No	Yes	No	Jan-03
	No	Yes	No	No	Jan-03
Control	Yes	Yes	Yes	Yes	Dec-03
	Yes	Yes	Yes	Yes	Dec-03
	Yes	Yes	No	Yes	Apr-04
	Yes	Yes	Yes	No	Dec-03
	No	No	Yes	No	Apr-04

ISSN: 1472-6963