Table 4

Results of the clustered lot quality assurance sampling surveys*to monitor yellow fever vaccination coverage before the end of the campaign, Sierra Leone, 28–29 November 2009
District Lot N Vaccination Card§ Verbal History
U D SE U D SE
Western Area Rural 1 50 2 A 0.02 1 A 0.02
Western Area Urban 2 50 4 A 0.05 4 A 0.05
Kambia 3 50 0 A 0.00 0 A 0.00
4 50 0 A 0.00 0 A 0.00
District Total 100 0 A 0-00 0 A 0.00
Koinadugu 5 50 6 A 0.06 4 A 0.05
6 50 10 R 0.07 8 R 0.08
District Total 100 16 R 0.05 12 A 0.05
Port Loko 7 50 18 R 0.19 14 R 0.17
8 50 7 A 0.12 7 A 0.12
9 50 11 R 0.09 7 A 0.04
District Total 150 36 R 0.08 28 R 0.07
Tonkolili 10 50 2 A 0.02 1 A 0.02
11 50 2 A 0.02 2 A 0.02
12 50 1 A 0.02 0 A 0.00
District Total 100 5 A 0.01 3 A 0.01

N: sample size; U: number of Unvaccinated in the sample; D: Decision; A: Accepted; R: Rejected; SE: Standard Error of the distribution of the vaccination variable between the clusters in the lots.

* Sampling plans used: UT = 90% and LT = 75%, with d = 7 when N = 50 (5x10); d = 15 when N = 100 (10x10); d = 25 when N = 150 (15x10).

§ Used to take operational decisions in the field before the end of the campaign.

Pezzoli et al.

Pezzoli et al. BMC Public Health 2012 12:415   doi:10.1186/1471-2458-12-415

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