Table 1. Characteristics of the study population.
n | Children included in the analysis [%] | n | Children not included in the analysis [%]a | P-value | |
Sociodemographic variables | |||||
Age (month) | 836 | 282 | |||
< = 36 | 54.1 | 52.1 | NS | ||
>36 | 45.9 | 47.9 | |||
Age (year) | 836 | 282 | |||
1 | 35.4 | 34.7 | NS | ||
2 | 18.4 | 17.4 | |||
3 | 17.7 | 15.6 | |||
4 | 15.4 | 14.2 | |||
5 | 13.0 | 18.1 | |||
Sex | 836 | 317 | |||
male | 50.4 | 51.1 | NS | ||
female | 49.6 | 48.9 | |||
Village | 836 | 317 | |||
a | 10.0 | 7.3 | 0.01 | ||
b | 11.7 | 12.0 | |||
c | 23.3 | 15.8 | |||
d | 8.8 | 10.4 | |||
e | 12.9 | 11.7 | |||
f | 12.4 | 18.6 | |||
g | 9.0 | 8.5 | |||
h | 11.7 | 15.8 | |||
Genotype distribution | |||||
No of copies of Hp2 allele | 836 | 61 | |||
0 | 20.9 | 21.3 | NS | ||
1 | 58.0 | 59.0 | |||
2 | 21.1 | 19.7 | |||
-101C-G | 836 | 162 | |||
CC | 73.2 | 71.0 | NS | ||
CG | 25.4 | 25.3 | |||
GG | 1.4 | 3.7 | |||
-61A-C | 836 | 161 | |||
AA | 74.8 | 83.2 | 0.02 | ||
AC | 25.2 | 16.8 | |||
CC | 0.0 | 0.0 | |||
HbS | 807 | 177 | |||
HbAA | 82.0 | 86.4 | NS | ||
HbAS | 18.0 | 13.7 | |||
Trachoma status | |||||
Active trachoma a | 836 | 317 | |||
Yes | 21.4 | 17.7 | NS | ||
No | 78.6 | 82.3 |
Out of the 1155 children who had trachoma assessment, 836 children were included in the final analyses and 319 were not (because of missing data or because they were found to have sickle cell disease (HbSS), trachomatous scarring (TS) or protein-energy malnutrition as determined by weight-for-height z-score<−3 SD). In the 836 individuals included HWE p-values were <0.0001; 0.184, and <0.0001 for Hp1/2, -101C-G, and -61A-C, respectively.