Table 1.

Minimum sample size required for urban and rural settings of each region [12, 13, 14].

No	Regions	Prevalence observed in the 2012 HIV-SSS		Minimum number of pregnant women to be enrolled		Number of pregnant women to be enrolled (i.e. 10% round up)
		Rural	Urban	Rural	Urban	Rural	Urban
1	Adamawa	6.98	4.85	277	197	305	217
2	Centre	9.43	13.88	365	510	401	561
3	Far-North	0.68	7.05	29	280	32	308
4	East	10.7	7.26	408	287	449	316
5	Littoral	9.59	10.67	370	407	407	448
6	North	3.01	5.61	125	226	137	249
7	North-West	7.95	9.44	312	365	344	401
8	West	6.12	4.02	245	165	270	181
9	South-West	10.03	11.05	385	420	424	461
10	South	11.84	8.41	446	329	490	362

SSS: Sentinel Surveillance Survey.