Calculations

Question 1

Add up the total data elements/number of data elements

Answer 1

Mean

Question 2

Arrange the numbers in order from least to greatest

Then you determine the number of data elements

Formula: N+1/2 – N being the number of data elements in the data set

EX: 1,2,3,4,5,6,7,8,9
9+1/2
10/2 = 5 – fifth number in the list
Answer: 5

EX:  1, 2, 3, 4, 5, 6, 7, 8
        8+1/2
        9/2 = 4.5
Average the 4th  and 5th  number in the data set and divide by 2 
Answer: 4.5

EX: 1, 4, 6, 8, 9, 11, 13, 15, 17
9+1/2
10/2 = 5 Answer: 9

Answer 2

Median

Question 3

Arrange the numbers in order from least to greatest – don’t have to, but makes it easier

Count the number of times each number is present

Answer: Number that appears the most

Answer 3

Mode

Question 4

Take all of the values and place them in order

Take your score/number of data elements x 100

EX: 80, 82, 85, 91, 92, 93, 95, 97, 98

5/9 x 100 = 55.5th or 56th

Answer 4

Percentiles

Question 5

Number of inpatient deaths (including newborns)/Number of discharges (including newborn)

EX: 5 deaths/400 discharges = 1.25%
Death rate is 2 decimal places
Death rate is a percentage so x 100

Answer 5

Gross Death Rate

Question 6

Formula: (Number of Inpatient deaths (Including Newborns) – deaths less than 48hrs since admission)/Number of discharges (Including Newborns) – deaths less than 48hrs since admission

EX: 8 death, 3 deaths within 48hrs, and 155 discharges
8-3/155-3 = 5/152 = 3.29%
X 100 to get a percentage and convert it into 2 decimal places

Answer 6

Net Death Rate

Question 7

Number of patients with a specific illness who expire/total number of patients with the specific illnesses

EX: COVID 18 covid deaths/246 patients discharged-covid = 7.32%
X 100 to get a percentage. Round up to two decimals

Answer 7

Case Fatality Rate

Question 8

Number of deaths caused by anesthetic agents/Number of anesthetic agents administered

EX: 2 deaths due to anesthetic/1468 agents administered
2/1468 = 0.136% or 0.14% rounded to two decimal places
X 100

Answer 8

Anesthesia Death Rate

Question 9

Formula: Number of deaths within 10 days of the surgical procedure/Number of patients who were operated on

EX: 1/8 = 0.125 = 12.5
X 100 to get a percent and round up two decimal points

Answer 9

Post-Operative Death Rate

Question 10

Number of cancer deaths/Number of population at risk

EX: 596, 423/326, 148, 923 = 0.183%
X 100 to get percent and round up 2 decimals

Answer 10

Cancer Mortality Rate

Question 11

Mean + Standard Deviation x whatever number

EX: Mean is 1
Standard Deviation is 1.5 x 1
Answer: 2.5

EX: Mean is 1
Standard Deviation is 1.5 x 2
Answer: 4

Answer 11

Standard Deviation Data Elements