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Table 1.

Sample sizes for population and subgroups in training and test datasets

SampleTraining set (n = 250)Test set (n = 44)
TotalSubgroupTotalSubgroup
Range 17–1305 8–653 8–477 1–185 
Mean 126.7 50.0 96.6 38.1 
Median 77 29 39 20 
Studies with n ≤ 50 80 (32.0%) 192 (76.8%) 23 (52.3%) 35 (79.6%) 
Studies with n ≤ 30 24 (9.6%) 136 (54.4%) 14 (31.8%) 28 (63.6) 
Studies with n ≤ 20 3 (1.2%) 82 (32.8%) 8 (18.2%) 22 (50.0%) 
SampleTraining set (n = 250)Test set (n = 44)
TotalSubgroupTotalSubgroup
Range 17–1305 8–653 8–477 1–185 
Mean 126.7 50.0 96.6 38.1 
Median 77 29 39 20 
Studies with n ≤ 50 80 (32.0%) 192 (76.8%) 23 (52.3%) 35 (79.6%) 
Studies with n ≤ 30 24 (9.6%) 136 (54.4%) 14 (31.8%) 28 (63.6) 
Studies with n ≤ 20 3 (1.2%) 82 (32.8%) 8 (18.2%) 22 (50.0%) 
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