Table 1.

Characteristics of practices that participated in study.

Practice	Description	Approximate number of patients on methadone treatment at practice	Clinical records
A	3.0 FTE doctor teaching general practice in Dublin's south inner city	19	Combined electronic/paper
B	Four doctor teaching general practice in Dublin's south inner city	45	Combined electronic/paper
C	2.5 FTE general practice in Dublin's north inner city	70	Combined electronic/paper