Skip to main content

Table 1 sample size determination by using factors associated with TBI

From: Outcomes and associated factors of traumatic brain injury among adult patients treated in Amhara regional state comprehensive specialized hospitals

Factors

Assumptions

Exposed

Non exposed

Power

Ratio

P1

CI %

P2

COR

N

Reference

age

 < 20

61

9

80%

1:1

87.1%

95%

   

[24]

Age > 60

14

39

80%

1:1

 

95%

26.4%

18.8

26

Conservative treatment

No

104

20

80%

1:1

83.8%

95%

   

Yes

179

75

80%

1:1

 

95%

70.4%

2.179

336

Time to arrival

 < 24 Hour

226

16

80%

1:1

93.3%

95%

    

 > 24 Hour

57

79

80%

1:1

 

95%

41.9%

19.5

32

 
  1. Ratio non- exposed to exposed, P1% of outcome in the exposed group, P2% of outcome in the unexposed group, n sample size
Back to article page

BMC Emergency Medicine

ISSN: 1471-227X

Contact us