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Epidemiology > Calculations For Test 2 > Flashcards

Calculations For Test 2 Flashcards

1
Q

How to calculate prevalence

A

Cases at certain time point /
Population at the same time point

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2
Q

How to calculate cumulative incidence

A

New cases in time period
/
Population at risk in the beginning of time period

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3
Q

How to calculate CI of fixed populations

A

New cases in time period
/
Pop. At risk in beginning of time period - 0.5 * withdrawals

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4
Q

How to calculate incidence rate?

A

New cases at certain time period
/
Time at risk in time period

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5
Q

How to calculate approximate incidence

A

New cases /
Number of animals at risk in beginning of time period + number of animals in end of time period / 2 * time period

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6
Q

How to calculate exact incidence

A

New cases /
(1x5) + (1x2) + (1x8) etc etc

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7
Q

How to calculate sensitivity

A

A
/
A+C

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8
Q

How to calculate specificity

A

D
/
B+D

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9
Q

How to calculate positive prevalence

A

A
/
A+b

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10
Q

How to calculate negative prevalence

A

D
/
C+D

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11
Q

How to calculate apparent prevalence

A

A+B
/
A+b+c+d

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12
Q

How to calculate true prevalence

A

A+C
/
A+B+c+d

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13
Q

When to use “detection of disease “ in Winepi

A

When you want to find the diseased animals in the herd

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14
Q

When to use “maximum possible prevalence” in winepi

A

When you want to know the worst case scenario for infections

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15
Q

When to use “estimate percentage” in winepi

A

When you want to estimate the proportion of cases

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16
Q

When to use “estimate mean” in winepi

A

When you want to estimate some factor, like weight gain

17
Q

When to use “estimate differences between percentages” in winepi

A

When you want to compare two groups

18
Q

How to calculate risk of factor 1

A

A
/
A+b

19
Q

How to calculate risk of factor 2

A

C
/
C+d

20
Q

How to calculate relative risk

A

Risk of factor 1
/
Risk of factor 2

21
Q

How to calculate attributable risk

A

Risk of factor 2

22
Q

How to calculate odds ratio

A

A/b
/
C/d

23
Q

How to calculate population attributable risk

A

((A+c) / a+b+c+d) - C / (c+d)

Epidemiology (3 decks)

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