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KAIS 2007 1 - Kenya National AIDS & STI Control Programme ...

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D ATA IN C ONTEXTDifferences in the <strong>2007</strong> KNBTS and <strong>KAIS</strong> national estimates for blood donationBased on KNBTS statistics, approximately 124,000 blood units were collected by the KNBTScentres in <strong>2007</strong>; this is roughly 62.6% of the <strong>2007</strong> <strong>KAIS</strong> national estimate of 198,000 [95% CI160,000, 240,000] persons who reported donating to a blood transfusion service.The reasons for the discrepancy in the two estimates need further evaluation, but may includethe following possible explanations. The question in the <strong>2007</strong> <strong>KAIS</strong> that specifies source ofblood donation request among donors in the year before the survey was limited to threepossible sources: blood transfusion service, family/friend, or other/unknown. Though mostpersons who donate blood do so through the KNBTS network, it is still possible to voluntarilydonate blood to a private hospital blood bank outside of this network. Therefore, thedenominators for the KNBTS and <strong>KAIS</strong> estimate are not necessarily the same. Further, the<strong>2007</strong> <strong>KAIS</strong> data are based on participant self‐report and are therefore subject to participantrecall bias. In the <strong>2007</strong> <strong>KAIS</strong>, participants were asked if they had donated in the past year,though it is possible that the participant reported donations beyond the one year time frame.Finally, in contrast to the KNBTS estimate, the <strong>2007</strong> <strong>KAIS</strong> estimate is an extrapolated estimatebased on the <strong>2007</strong> projected population aged 15‐64 years in the 1999 Analytical Report onPopulation projections, Volume II, <strong>Kenya</strong> <strong>National</strong> Bureau of Statistics (KNBS). Because thereare strict eligibility criteria for age, weight, and clinical ranges to donate blood in <strong>Kenya</strong>, notall persons aged 15‐64 years are equally eligible to donate blood. Population projections usedto calculate the national estimate for blood donation were based on age, sex and provincialdistributions in the total general population of persons aged 15‐64 years and not the eligibledonor population. In addition, there is a possibility that KNBTS data were incomplete due toreporting lapses or inconsistencies across the country. These in combination would have likelycontributed to an overestimation of the <strong>2007</strong> <strong>KAIS</strong> national estimate of reported blooddonations in the year before the survey.Though the discrepancy between the KNBTS and <strong>KAIS</strong> estimates is considerable, the <strong>2007</strong><strong>KAIS</strong> estimate nonetheless gives some indication of the pool of potential blood donors that theKNBTS network may not reaching.<strong>KAIS</strong> <strong>2007</strong> 168

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