Incidence (Epidemiology lecture) short ppt to understand incidence. primary incidence rate, secondary incidence rate, incidence rate, examples of incidence, incidence rate related question are discussed in this lec.

1. WRITTEN & PRESENTED
BY:
MUHAMMAD AKBAR
RASHID QADRI
(BSVS, MS HCM)
Incidence

2. Statistical Terms
Rate:
Rate refers to the occurrence of events over a
specific interval of time in a specific population
Example:
Number of deaths per 10,ooo population in one
year.

3. Statistical Terms
Ratio:
It shows relation in size between two random
quantities
Example:
Number of male deaths : No of female deaths

4. Statistical Terms
Proportion:
Occurrence of event in specific population
(No specific Time)
Example:
No of deaths in specific population

5. Incidence:
Number of new cases occurring in a defined
population during a specific period of time
Incidence calculation:
New cases in defined population
Incidence: x 10n
Total population at risk over a specific period of time

6. Incidence Rate
Occurrence of new events in a specific period of time
in a defined population
Formula: Same as incidence
New cases in defined population
Incidence Rate: x 100
Total population at risk over a specific period of time

7. Types of Incidence Rate
1) Primary Attack Rate:
Occurrence of new cases over a specific period of
time
New cases in specific period of time
Attack rate: x 100
Total population at risk in specific period of time

8. Secondary Attack Rate
Occurrence of new cases after primary cases in a
specific period of time
New cases after primary cases in specific
period of time
Secondary Attack rate: x 100
Total population (Minus primary cases) at risk
in specific period of time

9. Q ?????
Why we use x 10, x 100, x 1000, x 10,000, x 1,00,00
In Formula ?????????

10. Importance of incidence
It is helpful
 In pathogeneses
 to find disease distribution
 to control diseases
 in preventive and therapeutic measurements
 in health policies making

11. How to solve questions