PMID- 19187516
OWN - NLM
STAT- MEDLINE
DCOM- 20090406
LR  - 20181201
IS  - 1365-3156 (Electronic)
IS  - 1360-2276 (Linking)
VI  - 14
IP  - 3
DP  - 2009 Mar
TI  - Cluster-sample surveys and lot quality assurance sampling to evaluate yellow 
      fever immunisation coverage following a national campaign, Bolivia, 2007.
PG  - 355-61
LID - 10.1111/j.1365-3156.2009.02231.x [doi]
AB  - OBJECTIVE: To estimate the yellow fever (YF) vaccine coverage for the endemic and 
      non-endemic areas of Bolivia and to determine whether selected districts had 
      acceptable levels of coverage (>70%). METHODS: We conducted two surveys of 600 
      individuals (25 x 12 clusters) to estimate coverage in the endemic and 
      non-endemic areas. We assessed 11 districts using lot quality assurance sampling 
      (LQAS). The lot (district) sample was 35 individuals with six as decision value 
      (alpha error 6% if true coverage 70%; beta error 6% if true coverage 90%). To 
      increase feasibility, we divided the lots into five clusters of seven 
      individuals; to investigate the effect of clustering, we calculated alpha and 
      beta by conducting simulations where each cluster's true coverage was sampled 
      from a normal distribution with a mean of 70% or 90% and standard deviations of 
      5% or 10%. RESULTS: Estimated coverage was 84.3% (95% CI: 78.9-89.7) in endemic 
      areas, 86.8% (82.5-91.0) in non-endemic and 86.0% (82.8-89.1) nationally. LQAS 
      showed that four lots had unacceptable coverage levels. In six lots, results were 
      inconsistent with the estimated administrative coverage. The simulations 
      suggested that the effect of clustering the lots is unlikely to have 
      significantly increased the risk of making incorrect accept/reject decisions. 
      CONCLUSIONS: Estimated YF coverage was high. Discrepancies between administrative 
      coverage and LQAS results may be due to incorrect population data. Even allowing 
      for clustering in LQAS, the statistical errors would remain low. Catch-up 
      campaigns are recommended in districts with unacceptable coverage.
FAU - Pezzoli, Lorenzo
AU  - Pezzoli L
AD  - European Programme for Intervention Epidemiology Training, European Centre for 
      Disease Control, Stockholm, Sweden. lorenzo.pezzoli@hpa.org.uk
FAU - Pineda, Silvia
AU  - Pineda S
FAU - Halkyer, Percy
AU  - Halkyer P
FAU - Crespo, Gladys
AU  - Crespo G
FAU - Andrews, Nick
AU  - Andrews N
FAU - Ronveaux, Olivier
AU  - Ronveaux O
LA  - eng
PT  - Journal Article
DEP - 20090128
PL  - England
TA  - Trop Med Int Health
JT  - Tropical medicine & international health : TM & IH
JID - 9610576
RN  - 0 (Yellow Fever Vaccine)
SB  - IM
MH  - Adolescent
MH  - Adult
MH  - Bolivia/epidemiology
MH  - Child
MH  - Child, Preschool
MH  - Endemic Diseases
MH  - Epidemiologic Methods
MH  - Female
MH  - Humans
MH  - Immunization Programs/*standards
MH  - Lot Quality Assurance Sampling
MH  - Male
MH  - Program Evaluation
MH  - Vaccination/statistics & numerical data
MH  - Yellow Fever/epidemiology/prevention & control
MH  - Yellow Fever Vaccine/*administration & dosage
EDAT- 2009/02/04 09:00
MHDA- 2009/04/07 09:00
CRDT- 2009/02/04 09:00
PHST- 2009/02/04 09:00 [entrez]
PHST- 2009/02/04 09:00 [pubmed]
PHST- 2009/04/07 09:00 [medline]
AID - TMI2231 [pii]
AID - 10.1111/j.1365-3156.2009.02231.x [doi]
PST - ppublish
SO  - Trop Med Int Health. 2009 Mar;14(3):355-61. doi: 
      10.1111/j.1365-3156.2009.02231.x. Epub 2009 Jan 28.