「Epi practicals - 12 April 2021」の版間の差分
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*Q3 | *Q3 | ||
| − | + | a) | |
{|class="wikitable" | {|class="wikitable" | ||
|- | |- | ||
| 45行目: | 45行目: | ||
|99,960 | |99,960 | ||
|} | |} | ||
| − | + | *Positive predictive value=<math>\frac{38}{38+1999.2}=0.187</math> | |
| − | + | *Negative predictive value=<math>\frac{97960.8}{2+97960.8}=0.999</math> | |
| − | + | b) | |
{|class="wikitable" | {|class="wikitable" | ||
|- | |- | ||
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|667 | |667 | ||
|} | |} | ||
| − | + | *Positive predictive value=<math>\frac{316.35}{316.35+13.34}=0.959</math> | |
| − | + | *Negative predictive value=<math>\frac{653.66}{1999.2+653.66}=0.246</math> | |
| + | |||
| + | *Q4 | ||
| + | To have high sensitivity is more important, because testing blood donor is a screening test and false-negative has to be excluded as much as possible. | ||
| + | |||
| + | *Q5 | ||
| + | We need to calculate PPV and show the director how much false-positive donors arise in order to advise not to inform test-positive donors without additional confirmation tests. | ||
2021年4月12日 (月) 15:14時点における版
Epi practicals
12 April 2021
Is this test useful
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)
| 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]
- Q4
To have high sensitivity is more important, because testing blood donor is a screening test and false-negative has to be excluded as much as possible.
- Q5
We need to calculate PPV and show the director how much false-positive donors arise in order to advise not to inform test-positive donors without additional confirmation tests.
