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Epi practicals
12 April 2021
Is this test useful
Practical - HIV
|
|
With disease
|
Without disease
|
| test positive
|
152
|
20
|
| test negative
|
8
|
980
|
- Q2
- Sensitivity=[math]\displaystyle{ \frac{152}{160} = 0.95 }[/math]
- Specificity=[math]\displaystyle{ \frac{980}{1000} = 0.98 }[/math]
|
|
With disease
|
Without disease
|
| test positive
|
38
|
1999.2
|
| test negative
|
2
|
97960.8
|
| sum
|
40
|
99,960
|
- Positive predictive value=[math]\displaystyle{ \frac{38}{38+1999.2}=0.187 }[/math]
- Negative predictive value=[math]\displaystyle{ \frac{97960.8}{2+97960.8}=0.999 }[/math]
|
|
With disease
|
Without disease
|
| test positive
|
316.35
|
1999.2
|
| test negative
|
13.34
|
653.66
|
| sum
|
333
|
667
|
- Positive predictive value=[math]\displaystyle{ \frac{316.35}{316.35+13.34}=0.959 }[/math]
- Negative predictive value=[math]\displaystyle{ \frac{653.66}{1999.2+653.66}=0.246 }[/math]
