ChatGPT actually gives a very good explanation of this:
Person-years is a measurement used in epidemiology and demographic studies to estimate the number of people at risk for a certain event (like death or disease) over a specific period. It helps to account for both the number of people in a population and the length of time they are at…
ChatGPT actually gives a very good explanation of this:
Person-years is a measurement used in epidemiology and demographic studies to estimate the number of people at risk for a certain event (like death or disease) over a specific period. It helps to account for both the number of people in a population and the length of time they are at risk.
To calculate deaths per 100,000 person-years, follow these steps:
1. Determine the study population: Identify the group of people you are studying, such as a specific age group or people with a particular health condition.
2. Calculate the total person-time at risk: This is the sum of the time that each person in the study population is at risk for the event of interest (in this case, death). Person-time at risk is usually measured in person-years.
To calculate person-time at risk, multiply the number of people in the population by the number of years they are observed. If individuals have different follow-up times, you would sum the individual follow-up times for each person in the population.
For example, suppose you are studying a group of 1,000 people over a 5-year period. The total person-time at risk would be:
1,000 people x 5 years = 5,000 person-years
3. Count the number of deaths: Determine the total number of deaths in the study population during the observation period.
4. Calculate the death rate: Divide the number of deaths by the total person-time at risk.
For example, suppose there were 50 deaths during the 5-year period. The death rate would be:
50 deaths / 5,000 person-years = 0.01
5. Calculate the death rate per 100,000 person-years: Multiply the death rate by 100,000.
0.01 x 100,000 = 1,000 deaths per 100,000 person-years
So, in this example, the death rate would be 1,000 deaths per 100,000 person-years.
4. Calculate the death rate: Divide the number of deaths by the total person-time at risk.
So, does that mean an unvaxxed person would be at zero risk since they didn't take the vax? Which leads to division by zero, which makes an infinite number of unvaxxed deaths. Oy Vey. Please tell AI that I don't get it. 🤖
I think they use person-years so that they can vary the time interval when calculating mortality rate. Steve's spreadsheet looks at monthly mortality rate. Others might want to calculate a daily, weekly, quarterly or annual rate etc.
ChatGPT actually gives a very good explanation of this:
Person-years is a measurement used in epidemiology and demographic studies to estimate the number of people at risk for a certain event (like death or disease) over a specific period. It helps to account for both the number of people in a population and the length of time they are at risk.
To calculate deaths per 100,000 person-years, follow these steps:
1. Determine the study population: Identify the group of people you are studying, such as a specific age group or people with a particular health condition.
2. Calculate the total person-time at risk: This is the sum of the time that each person in the study population is at risk for the event of interest (in this case, death). Person-time at risk is usually measured in person-years.
To calculate person-time at risk, multiply the number of people in the population by the number of years they are observed. If individuals have different follow-up times, you would sum the individual follow-up times for each person in the population.
For example, suppose you are studying a group of 1,000 people over a 5-year period. The total person-time at risk would be:
1,000 people x 5 years = 5,000 person-years
3. Count the number of deaths: Determine the total number of deaths in the study population during the observation period.
4. Calculate the death rate: Divide the number of deaths by the total person-time at risk.
For example, suppose there were 50 deaths during the 5-year period. The death rate would be:
50 deaths / 5,000 person-years = 0.01
5. Calculate the death rate per 100,000 person-years: Multiply the death rate by 100,000.
0.01 x 100,000 = 1,000 deaths per 100,000 person-years
So, in this example, the death rate would be 1,000 deaths per 100,000 person-years.
4. Calculate the death rate: Divide the number of deaths by the total person-time at risk.
So, does that mean an unvaxxed person would be at zero risk since they didn't take the vax? Which leads to division by zero, which makes an infinite number of unvaxxed deaths. Oy Vey. Please tell AI that I don't get it. 🤖
Say there are 1000 unvaxxed people and we are counting deaths over a time interval of 1 year. Say 50 of them die during that year.
The person-time at risk = 1000 people times 1 year = 1000 person-years
The number of deaths is 50
So the death rate is 50 per 1000 person-years or 0.5 per 100000 person-years
That one's on me - if I got that wrong we both have to go back to AI school!
That did NOT help me. 🤣🤣🤣
You did good here! Thanks.
Good AI use.
I think they use person-years so that they can vary the time interval when calculating mortality rate. Steve's spreadsheet looks at monthly mortality rate. Others might want to calculate a daily, weekly, quarterly or annual rate etc.