Table 1.

Cleaning physician list

	N	%
Physician list received from CT-DPH	18 642
Duplicates in the list	2056
Triplicates in the list	100
Quadruplicates in the list	12
Quintuplicates in the list	12
Unduplicated Physician list	16 462
Responses to the Physician postcard
No response	12 358	75.1
Postcard returned because of invalid address	999	6.1
Postcard returned completed	3105	18.9
Physicians excluded because of death, retirement, etc
Died	44	0.3
Retired	233	1.4
No Longer practises in CT	5828	35.4
Postcard returned: unknown if physician practises in CT	30	0.2
Target population after exclusions	10 327
Adjusted postcard response rate based on target population		30.1
Physicians receiving full survey
Refused to participate in the survey	91
Postcard returned; no preferred survey method specified; unable to contact physician to get a preferred method	9
Physician practices in CT; survey sent	2159
Response rate for survey	898	41.6