Table 1. Comparison of household-level characteristics of individuals enrolled in the original community-based measles serological survey and missed population study.
The original serosurvey was carried out in April—June 2022 in Ndola and Choma districts, Zambia, using stratified multi-stage cluster design. The follow-up missed population study was carried out in a subset of clusters of the original survey between July—August 2022. This study was carried out in a subsample of clusters from the original survey; in each selected cluster, a sample of households not available during listing of the original serosurvey, and hence excluded from its sampling frame, were randomly selected.
| Characteristic | Ndola | Choma | ||||
|---|---|---|---|---|---|---|
| Original, N = 454 | Missed Population, N = 366 | p-value3 | Original, N = 791 | Missed Population, N = 306 | p-value3 | |
| Sex of head of household | 0.13 | 0.012 | ||||
| Female | 33% | 38% | 28% | 36% | ||
| Male | 67% | 62% | 72% | 64% | ||
| Number of people in household1 | 6 (2) | 4 (3) | <0.001 | 6 (3) | 4 (3) | <0.001 |
| Households with children | 92% | 60% | <0.001 | 92% | 63% | <0.001 |
| Number of children in household1 | 2.23 (1.38) | 1.33 (1.49) | <0.001 | 2.68 (1.79) | 1.60 (1.66) | <0.001 |
| Wealth score1,2 | 1.90 (1.16) | 1.32 (1.21) | <0.001 | -1.31 (2.69) | -1.56 (2.79) | <0.001 |
1Mean (SD).
2Wealth score: A standardized score calculated after principal component analysis of socio-economic variables.
3Calculated using Pearson’s Chi-squared test; Wilcoxon rank sum test; Fisher’s exact test.