Clinic variation in recruitment metrics, patient characteristics and treatment use in a randomized clinical trial of osteoarthritis management

Table 2 Recruitment process variables across ten study clinics

	Clinic 1	Clinic 2	Clinic 3	Clinic 4	Clinic 5	Clinic 6	Clinic 7	Clinic 8	Clinic 9	Clinic 10	Average
# Medical records reviews	1,532	1,369	1,579	1,883	1,561	1,185	1,638	1,547	1,687	2,412	1,639
# Recruitment letters sent*	319	431	335	355	340	326	307	223	305	233	317
# Recruitment letters sent*	(21%)	(31%)	(21%)	(19%)	(22%)	(28%)	(19%)	(14%)	(18%)	(10%)	(19%)
# Patients refused before randomization^†	210	294	190	210	163	178	160	141	157	136	184
# Patients refused before randomization^†	(65%)	(68%)	(56%)	(59%)	(48%)	(55%)	(52%)	(63%)	(52%)	(58%)	(58%)
# Patients ineligible before randomization^†	43	73	63	63	62	80	79	35	52	57	61
# Patients ineligible before randomization^†	(14%)	(17%)	(19%)	(18%)	(18%)	(26%)	(26%)	(16%)	(17%)	(25%)	(19%)
# Patients not pursued after letter sent^{† ‡}	10	8	26	26	58	11	12	0	40	0	19
# Patients not pursued after letter sent^{† ‡}	(3%)	(2%)	(8%)	(7%)	(17%)	(3%)	(4%)	(0%)	(13%)	(0%)	(6%)
# Patients randomized^†	56	56	56	56	57	57	56	47	56	40	54
# Patients randomized^†	(18%)	(13%)	(17%)	(16%)	(17%)	(18%)	(18%)	(21%)	(18%)	(17%)	(17%)

*Percent of medical records reviewed. ^†Percent of patients who were mailed a recruitment letter. ^‡Due to enrollment goal being met.

ISSN: 1471-2474