Table 1.
Overall (Age group, ≥15 years) participation and response rates (percentages) of the population-based surveys conducted between 1995–2003 in selected rural and urban areas of Zambia
| 1995 | 1999 | 2003 | ||
| Listed | 5847 | 6235 | 6791 | |
| Absent | 927 (15.9%) | 1763 (28.3%) | 1346 (19.8%) | |
| De facto eligible (found) | 4920 | 4472 | 5445 | |
| Refused interview | 108 (2.2%) | 53 (1.2%) | 185 (3.4%) | |
| Interviewed | 4812 (97.8%) | 4419 (98.4) | 5260 (96.6%) | |
| Saliva test | Accepted | 4499 (93.5%) | 4021 (91%) | 4913 (93.4%) |
| Refused | 281(5.8%) | 397 (9%) | 347 (6.6% | |
| Lost | 32 (0.7%) | -- | -- | |
| Damaged/Mislabelled | 162 | 264 | 162 | |
| Sample (Interviewed & tested, Less damaged/mislabelled) § | 4337 (88.2%) | 3757 (84%) | 4751 (87.3%) | |
| Final sample age 15–59 years | 3158 | 3731 | 4751 | |
| Response (%) (Listed-[absent+refusals]/listed*100) | 77.4% | 64.5% | 72.3% | |
Notes: 1. §Percentages in the final sample analysed represents proportion of participation out of the de facto eligible population. This includes respondents aged ≥60 years in 1995 & 1999. 2. Information by sex was incomplete in the file linking the listed and interviewed respondents.