Clustered lot quality assurance sampling: a pragmatic tool for timely assessment of vaccination coverage.
Trop Med Int Health
; 16(7): 863-8, 2011 Jul.
Article
en En
| MEDLINE
| ID: mdl-21481106
ABSTRACT
OBJECTIVES:
To evaluate oral poliovirus vaccine (OPV) coverage of the November 2009 round in five Northern Nigeria states with ongoing wild poliovirus transmission using clustered lot quality assurance sampling (CLQAS).METHODS:
We selected four local government areas in each pre-selected state and sampled six clusters of 10 children in each Local Government Area, defined as the lot area. We used three decision thresholds to classify OPV coverage 75-90%, 55-70% and 35-50%. A full lot was completed, but we also assessed in retrospect the potential time-saving benefits of stopping sampling when a lot had been classified.RESULTS:
We accepted two local government areas (LGAs) with vaccination coverage above 75%. Of the remaining 18 rejected LGAs, 11 also failed to reach 70% coverage, of which four also failed to reach 50%. The average time taken to complete a lot was 10 h. By stopping sampling when a decision was reached, we could have classified lots in 5.3, 7.7 and 7.3 h on average at the 90%, 70% and 50% coverage targets, respectively.CONCLUSIONS:
Clustered lot quality assurance sampling was feasible and useful to estimate OPV coverage in Northern Nigeria. The multi-threshold approach provided useful information on the variation of IPD vaccination coverage. CLQAS is a very timely tool, allowing corrective actions to be directly taken in insufficiently covered areas.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Vacuna Antipolio Oral
/
Vacunación
/
Muestreo para la Garantía de la Calidad de Lotes
Tipo de estudio:
Evaluation_studies
/
Prognostic_studies
Límite:
Child, preschool
/
Female
/
Humans
/
Infant
/
Male
País/Región como asunto:
Africa
Idioma:
En
Revista:
Trop Med Int Health
Asunto de la revista:
MEDICINA TROPICAL
/
SAUDE PUBLICA
Año:
2011
Tipo del documento:
Article
País de afiliación:
Países Bajos