Table 3

Results of the clustered lot quality assurance sampling surveys*to monitor measles vaccination coverage before the end of the campaign, Sierra Leone, November 2009
District Lot N Vaccination Card-Verified§ Verbal History
U D SE U D SE
Western Area Rural 1 50 4 A 0.04 0 A 0.00
Western Area Urban 2 50 7 A 0.07 0 A 0.00
Kambia 3 50 1 A 0.02 0 A 0.00
4 50 2 A 0.02 0 A 0.00
District Total 100 3 A 0.02 0 A 0.00
Koinadugu 5 50 11 R 0.07 1 A 0.02
6 50 16 R 0.18 8 R 0.07
District Total 100 27 R 0.09 9 A 0.03
Port Loko 7 50 18 R 0.21 15 R 0.16
8 50 5 A 0.06 5 A 0.06
9 50 11 R 0.15 10 R 0.15
District Total 150 34 R 0.09 30 R 0.08
Tonkolili 10 50 1 A 0.02 0 A 0.00
11 50 2 A 0.04 2 A 0.04
12 50 1 A 0.02 0 A 0.00
District Total 150 3 A 0.02 2 A 0.01
Bombali 13 50 6 A 0.06 1 A 0.02
Kenema 14 50 1 A 0.02 0 A 0.00
Kono 15 50 0 A 0.00 0 A 0.00
Kailahun 16 50 3 A 0.04 3 A 0.04
Moyamba 17 50 5 A 0.04 5 A 0.04
Bonthe 18 50 8 R 0.14 8 R 0.14
Bo 19 50 5 A 0.05 0 A 0.00
Pujehun 20 50 2 A 0.02 2 A 0.02

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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