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Table 6 Sample size comparisons (Stroke/TIA 4-level)

From: Statistical reanalysis of vascular event outcomes in primary and secondary vascular prevention trials

  Sample size Multiplier
Dataset Binary Ordinal MWU t-test Binary Ordinal MWU t-test
1 4528 4052 1194 1196 1 0.89 0.26 0.26
2 17,986 11,970 3326 3904 1 0.67 0.18 0.22
3 15,292 10,072 2744 2828 1 0.66 0.18 0.18
4 5436 2382 704 898 1 0.44 0.13 0.17
5 25,090 8666 2426 3362 1 0.35 0.097 0.13
6 30,450 10,164 2958 5070 1 0.33 0.097 0.17
13 13,510 12,610 3806 3754 1 0.93 0.28 0.28
18 23,090 22,110 6486 7194 1 0.96 0.28 0.31
30 15,934 1582 442 566 1 0.099 0.028 0.036
31 6934 1952 608 802 1 0.28 0.088 0.12
32 115,114 63,792 17,482 19,952 1 0.55 0.15 0.17
33 15,198 10,862 3388 3450 1 0.71 0.22 0.23
55 37,646 37,456 10,924 12,186 1 0.99 0.29 0.32
Median (Q1-Q3) 0.66 (0.35–0.89) 0.18 (0.097–0.26) 0.18 (0.17–0.26)
  1. Abbreviations
  2. MWU: Mann-Whitney U test; Q1: lower 25% quartile; Q3: upper 75% quartile