. 2005 May;11(5):729–731. doi: 10.3201/eid1105.040871

Table. Utilization of CATI system for case-control study*.

Characteristic	Case-patients	Controls
Interview period	Sep 15–Sep 29	Sep 28–Oct 21
No. enrolled	151	302
No. calls made	1,357	10,101
No. refusals	56	330
Average interview length (min)	28	16
Interviewer hours	263	508

*CATI, computer-assisted telephone interview.