Table 1 |
||||
|
Call outcomes for all numbers dialled by contact method |
||||
|
Fixed-line |
% |
Mobile |
% |
|
|
|
||||
|
Total numbers dialled |
5390 |
100.0% |
3697 |
100.0% |
|
|
||||
|
Eligible for study |
190 |
3.5% |
145 |
3.9% |
|
|
||||
|
Completed interview |
140 |
2.6% |
128 |
3.5% |
|
|
||||
|
Personal refusal |
19 |
0.4% |
10 |
0.3% |
|
|
||||
|
Terminated/Incomplete interview |
0 |
0.0% |
0 |
0.0% |
|
|
||||
|
Unavailable for duration of survey |
31 |
0.6% |
7 |
0.2% |
|
|
||||
|
Ineligible (due to age, sex, language***) |
1935 |
35.9% |
1215 |
32.9% |
|
|
||||
|
Unknown eligibility |
785 |
14.6% |
1309 |
35.4% |
|
|
||||
|
No answer |
386 |
7.2% |
284 |
7.7% |
|
|
||||
|
Message left on recording device |
331 |
6.1% |
941 |
25.5% |
|
|
||||
|
Engaged |
34 |
0.6% |
70 |
1.9% |
|
|
||||
|
Refusal/Other |
34 |
0.6% |
14 |
0.4% |
|
|
||||
|
Number invalid |
2480 |
46.0% |
1028 |
27.8% |
|
|
||||
|
Business |
284 |
5.3% |
111 |
3.0% |
|
|
||||
|
Disconnected |
1902 |
35.3% |
897 |
24.3% |
|
|
||||
|
Fax/data line |
294 |
5.5% |
20 |
0.5% |
|
|
||||
|
Crude response rate* (%) |
73.7% |
88.3% |
||
|
|
||||
|
Estimated response rate** (%) |
53.8% |
45.0% |
||
|
|
||||
|
*completed interviews/eligible; see methods for detailed description ** completed interviews/(eligible + eligible/(eligible+ineligible) × unknown eligible); see methods for detailed description ***numbers with language difficulty comprised 15 of the ineligible fixed-line calls and 2 of the mobile calls |
||||
|
Liu et al. BMC Medical Research Methodology 2011 11:159 doi:10.1186/1471-2288-11-159 |
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