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Table 1 Characteristics of primary studies (N= 859) across and within the included meta-analyses (N= 46)

From: Small-study effects and time trends in diagnostic test accuracy meta-analyses: a meta-epidemiological study

Number of sample size Median Interquartile range Min-max
Across all meta-analyses    
Number of diseased 33 17-63 0-1,358
Number of non-diseased 36 18-100 0-49,973
Sample size 87 45-185 3-50,008
Time since first publication (years) 6 3-10 0-42
  Median of the median Interquartile range of medians Min-max of the median
Within meta-analyses    
Number of diseased 31 18-41 5-154
Number of non-diseased 38 18-87 0-11,276
Sample size 94 46-332 20-11,281
Time since first publication (years) 5 4-11 0-26