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Lecture 6

# HLTB15H3 Lecture Notes - Lecture 6: Disability-Adjusted Life Year, General Idea, Life Table

2 pages110 viewsWinter 2014

Department

Health StudiesCourse Code

HLTB15H3Professor

Lianne TrippLecture

6This

**preview**shows half of the first page. to view the full**2 pages of the document.**Lecture 6 – HLTB15

- Z scores can tell us where there is a difference between two items. If the value is greater

than 1.96, we will say there is a statistical significance. When the found value is below

we accept the null hypothesis of no change.

- Based on example in class:

52.54 - 45.66 / square root of [(0.56)squared + (0.52)squared]

6.88 / square root of [0.584]

6.88 / 0.764

9.00

- Years of potential life lost (YPLL) is calculated for a specific cause of death and typically

range from thousands to millions. We won’t actually be able to calculate this on the

exam.

-Equation: YPLL = total of [person’s age at death – predetermined age at death

(which is 65 in the USA)]

- Tay Sach’s = always leads to death by the age of 3 or 4, it’s a neurodegenerative

disease, gene is passed on from parents.

- Example in class: What disease has the highest YPLL, Tay Sach’s or breast cancer?

ANSWER = Tay Sach’s (highest means the more likely to die earlier)

Defining Disability

- Disease impairment disability handicap

- (DFLE) Disability free life expectancy – looks at number of years people live in a

population without a disability. You need to use a life table.

- (DALY) Disability-adjusted life years – 1 is healthy and 0 is unhealthy. Years of life lost

component and years of disability component.

- These do not take into account that some disabilities are reversible.

Observational studies

- Descriptive: just descriptive… look at mortality records or surveys; just observe rates.

- Most studies are observational studies.

- Ecological studies

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