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Table 2 Values of η ( n ) in the formula ( 12 ) and the formula ( 15 ) for Q ≤50, where n =4 Q +1

From: Estimating the sample mean and standard deviation from the sample size, median, range and/or interquartile range

Q

η( n)

Q

η( n)

Q

η( n)

Q

η( n)

Q

η( n)

1

0.990

11

1.307

21

1.327

31

1.334

41

1.338

2

1.144

12

1.311

22

1.328

32

1.334

42

1.338

3

1.206

13

1.313

23

1.329

33

1.335

43

1.338

4

1.239

14

1.316

24

1.330

34

1.335

44

1.338

5

1.260

15

1.318

25

1.330

35

1.336

45

1.339

6

1.274

16

1.320

26

1.331

36

1.336

46

1.339

7

1.284

17

1.322

27

1.332

37

1.336

47

1.339

8

1.292

18

1.323

28

1.332

38

1.337

48

1.339

9

1.298

19

1.324

29

1.333

39

1.337

49

1.339

10

1.303

20

1.326

30

1.333

40

1.337

50

1.340

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BMC Medical Research Methodology

ISSN: 1471-2288

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