Epi practicals - 12 April 2021
Epi practicals
12 April 2021
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Practical - HIV
- Q1
| 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]
- Q3
- a)
| 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]
- b)
