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Table 4 Comparison of precision (1/SE) and classification of studies based on pilot/feasibility or sample size categories

From: Influence of pilot and small trials in meta-analyses of behavioral interventions: a meta-epidemiological study

 

Precision

Percentage of trials per decile of precision

 

Decile of precision

Minimum

Maximum

N > 370

N > 100 to 369

N < 100

Pilot

ES

(95CI)

0 to 10%

1.11

2.95

1%

4%

36%

59%

0.44

(0.31, 0.56)

10 to 20%

2.96

3.75

0%

5%

51%

44%

0.58

(0.47, 0.69)

20 to 30%

3.78

4.36

2%

5%

67%

27%

0.32

(0.22, 0.43)

30 to 40%

4.36

5.32

4%

36%

40%

20%

0.32

(0.21, 0.42)

40 to 50%

5.33

6.57

5%

74%

7%

14%

0.26

(0.16, 0.36)

50 to 60%

6.58

8.05

3%

74%

4%

19%

0.20

(0.10, 0.30)

60 to 70%

8.06

9.83

29%

60%

2%

8%

0.16

(0.06, 0.26)

70 to 80%

9.83

11.57

77%

14%

1%

9%

0.17

(0.08, 0.27)

80 to 90%

11.59

15.76

78%

9%

4%

10%

0.08

(− 0.02, 0.18)

90 to 100%

15.81

106.50

88%

3%

3%

6%

0.04

(− 0.06, 0.13)