Skip to main content

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