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Following appropriate institutional approval, 43 ICUs were selected using the proportional probability sampling technique.
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This sample size was determined using the probability proportional to size formula according to Yates and Grundy (1953).
In rural areas, the villages were selected at the first stage by using the Probability Proportional to Size (PPS) sampling scheme.
The 144 EAs were randomly selected nationwide using the probability proportional to size (PPS) sampling method.
The 32 clusters were selected using the probability proportional to size technique.
The 36 clusters were selected using the probability proportional to size method.
The clusters were selected and allocated to the IDP camps using the probability proportional to size technique [ 38].
Sites were stratified by district and randomly selected using the probability proportional to size, for both groups.
In the urban sub-districts, obstetric health facilities were selected using the probability proportional to size methodology [ 18].
From each study group, 44 clusters were randomly selected by using the probability proportional to size method.
One region was then selected from each non-SR stratum using the probability proportional to size method.
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