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Table 2 Probability of finding a tracer medicine manufactured in Tanzania in a sample outlet, by rural and urban location, 2006 and 2009 (40 medicines)

From: Local production of pharmaceuticals in Africa and access to essential medicines: 'urban bias’ in access to imported medicines in Tanzania and its policy implications

Location 2006 2009
Probability Standard error Sample size Probability Standard error Sample size
Rural 0.172 0.0087 1880 0.113 0.0073 1880
Urban 0.163 0.0086 1840 0.097 0.0070 1800
Difference 0.009 0.0122   0.016 0.010  
Two sample test of proportions: z-test = 0.7588 z-test = 1.587
H0 : Prural = Purban Pr(|Z| < |z|) = 0.4480 Pr(|Z| < |z|) = 0.112
Ha : Prural ≠ Purban Null-hypothesis is accepted Null-hypothesis is accepted