DESCRIBTIVE BIOSTATISTIC WORKSHOP

غير / األمراض مكافحة إدارة الدراسات و االحصاء قسمالسارية

Dr Tarekk Alazabee

PercentageQualitative Data Summarization

Rate Ratio

2015

Learning Objective

Identify and combute the different measures of qualitative data summarization

At the end of this presentation, the participant will be able to:

I. Proportion Definition: Is the number (a) of

observations with a given characteristics (such having MI) divided by the total number of observation.

Proportion =

EXAMPLE

Male FemaleNo of CVD Patients

60 60

Myocardial. I 5 3

Question: What is the proportion of an MI among Male Patients ?

النسبة

The Proportion of an MI among Male Patients:

5 / 60 = 0.083

aa + b

A proportion: Is always defined as apart divided

by the whole.

Is useful for ordinal and numerical data as well as nominal data, especially when the observations have been placed in a frequency table.

5 33.36 40.04 26.715 100.0

Age Group1 - 56 - 1011 - 15Total

Frequency Percent

Q: What is the proportion of Patients Aged between 6 and 10 years?

. Percentage Is the proportion multiplies by

100.

Q: What is the Percentage of an MI among Male Patients ?

Male FemaleNo of CVD Patients

60 60

MI 5 3

(5 / 60) * 100 = 8.3 %

The Percentage of an MI among Male Patients:

MI

II. Ratio Is the number (a) of observations in

a given group with a given characteristic ( such as having an MI) divided by the number (b) of observations without the given characteristic (such as not having MI) RATIO = A / B

التناسب

Q: Among Male patients: What is the ratio of those who had an MI to those who did not?

Male FemaleNo of CVD Patients

60 60

MI 5 3

EXAMPLE

التناسب

Male FemaleNo of CVD Patients

60 60

MI 5 3Without MI 55 57The ratio of those who had an MI to those who did not for male patients:

ab

Ratio= 5 /55 = 0.09

5 : 55 + 50

1 : 11

MI PATIENTS Without MI PATIENTS

=

=

Remember

A ratio is always defined as a part divided

by an other part.

المقام من جزءا ليس البسط

III. Rate Are similar to proportion except

that a multiplier (eg,1000, 10.000 or 100.000) is used, and they are computed over specified period of time.

- The multiplier is called the base.Rate = X Base

المعدل

What is the Rate of MI per 1000 male patients in 2014 ?

Male FemaleNo of CVD Patients

60 60

MI 5 3

The admission number of CVD patients at Hospital A in 2014

0.083 X 1000 = 83 MI cases per 10.000 CVD admissionsIn 2014

Proportion Base Time Rate

Percentage

RatioRate

Studies

Reports