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Table 1 Sampling stratification used to select schools in Oromia Regional State, Ethiopia, based on ecological zones defined according to epidemiologically significant differences in elevation and rainfall, based on classifications used by the Ministry of Health and WHO Ethiopia office [39]

From: School-based surveys of malaria in Oromia Regional State, Ethiopia: a rapid survey method for malaria in low transmission settings

Stratum description Elevation
(m asl)1
Stratum Total schools
in stratum
Proportion of
sample
Schools
sampled
Highland, occasional epidemic 2,000-2,500 1 1651 0.1 20
Highland fringe, low unstable transmission 1,750-2,000 2 1209 0.409 73
Highland fringe, high unstable transmission 1,500-1,750 3 1163 0.393 71
Lowland with seasonal transmission (annual rainfall 500-1000 mm) <1,500 4 389 0.132 24
Lowland with intense transmission (annual rainfall >1000 mm) <1,500 5 196 0.066 12
Highland >2,500 6 592 Not included in survey
Arid lowland (annual rainfall <500 mm) <1,500 7 4 Not included in survey
  1. 1 Metres above sea level.