measuring agrability outcomes with quality of life indicators robert a. wilson, ph.d., m.sc....

Measuring AgrAbility Outcomes with Quality of Life Indicators

Robert A. Wilson, Ph.D., M.Sc. University of Delaware Center for Applied Demography and Survey

Research Newark, Delaware 19716

rwilson@udel.edu

Paper presented National AgraAbility Project Training Workshop

Burlington, Vermont, November 8, 2005

Types of Program Evaluations

Process Evaluations Impact Evaluations

Process Evaluations Analyze Program Inputs

Client RecordsOutreach activityServices DeliveredProcedures FollowedDay-by-day Staff ActivityCosts Materials

Impact Evaluations Measure Program Outputs

ProductivityFarm outputIndividual farmer or waterman outputEfficiencyBenefits/Costs

Satisfaction with services providedImprovements in Quality of Life

Which AgrAbility outcome is most important?

Improved Productivity? Satisfaction with services delivered? Improvements in the Quality of Life?

A farmer could increase productivity as a result of AgrAbility, but

Register a low level of satisfaction with the services that were provided

Experience no improvement in the quality of life

A farmer could be very satisfied with the services provided by AgrAbility but Register no changes in farm output Experience no improvement in the quality of

life

A farmer could experience an improvement in the quality of life as a result of AgrAbility, but Be dissatisfied with the AgrAbility Program Register no changes in farm productivity as a

result of the program

The 3rd scenario: may be common among:

Older FarmersFarmers with certain disabilities, e.g.

arthritisFarmers who do not wish to retire

from farming or who cannot retire from farming

With an aging agricultural labor force, improvements in the quality of life may be particularly important for AgrAbility programs.

Older farmers are particularly susceptible to the degenerative diseases of aging

Arthritis Coronary disorders Cancer Tobacco-related diseases Diseases associated with exposure to toxic

chemicals Clinical Depression Dementia (including Alzheimer’s Disease)

Degenerative diseases are normally marked with a decline in the Quality of Life

How is the quality of life measured in medicine and in rehabilitative services?

Quality of Life Measurements

Disability-Adjusted Life Years (DALYs) Quality-Adjusted Life Years (QALYs)

Disability Adjusted Life Years (DALYs)

Used to measure the burden of disease in large populations: countries, states, counties

DALYs are a hybrid measure that combines premature mortality with time lived with a disease

One disability-adjusted life year (1 DALY) indicates that one person either died a yearprior to life expectancy, or lived with a disability for a year at a psychometricthreshold equivalent to death. If a disorder is severe, it receives a weightthat is closer to one (the psychometric equivalent of death). If a disorder is notsevere, it receives a weight that is closer tozero (the equivalent of perfect health). DALYs can be aggregated for groupsof people and geographic areas.

DISABILITY ADJUSTED LIFE YEAR (DALY)

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Example:

If a population had 10 people at the beginningof 2002:

…5 of the people lived in perfect health throughout the year = 0 DALYs

…1 female, aged 80, died of alcohol-related cirrhosis, (Life Expectancy: 82) = 2 DALYs

…1 male, aged 50, died of lung cancer, (Life Expectancy: 80) = 30 DALYs

…2 males, both aged 20, died in alcohol-related accidents: (Life Expectancy: 80) = 120 DALYs

…1 female (any age) lived with alcohol-related cirrosis for the entire year (1 year x disability weight .20) .20 DALYs

_____________Total 152.20 DALYs

Health Services Policy Research GroupUniversity of Delaware

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Disability-Adjusted Life Years (DALYs) per 1000 Population (Age-Adjusted) Attributable to Alcohol Dependence and Alcoholic Liver Cirrhosis by Census

Tract, State of Delaware, 1988-1993

Less than Delaware Mean

Delaware =8.4

Greater than Delaware MeanMissing Data

New JerseyPennsylvania

Maryland

Atlan

tic O

cean

Quality-Adjusted Life Years (QALYs)

QALYs are a summary measure used to measure the health-related quality of life for both individuals and groups.

QALYs are frequently employed to gauge changes in the quality of life associated with therapy or new drugs

There are a number of standardized instruments from which QALYs may be generated

One instrument is the SF-36, which we are currently using in a small sample of farmers which is being carried by Peggy Mack.

The recommended QALY measure is The SF-36 instrument

The SF-36 Health Survey

1. In general would you say that your health is1. Excellent

2. Very Good

3. Good

4. Fair

5. Poor

2. Compared to a year ago, how would you rate your health now?

1. Much better

2. Somewhat better

3. About the same

4. Somewhat worse

5. Much worse

Vigorous activities,

Such as running, lifting heavy objects, participating in strenuous

sports?

Moderate activities, such as moving a table, pushing a vacuum cleaner, bowling, or playing golf

Lifting or carrying groceries

Climbing several flights of steps

Climbing one flight of steps

Bending kneeling, or stooping

Walking more than a mile

Walking several hundred yards

Walking one hundred yards

Bathing or dressing yourself

4. During the last 4 weeks how much of the time have you had any of the following problems with your work or other regular daily activities as a result of your physical health?-all of the time-most of the time-some of the time-a little of the time-none of the time

Cut down on the amount of time you spent on work or other activities

Accomplished less than you would like

Were limited in the kind of work or other activities

Had difficulty performing the work or other activities

5. During the last 4 weeks how much of the time have you had any of the following problems with your work or other regular daily activities as a result of any emotional problems (such as being depressed or anxious)?

-All of the time-Most of the time-Some of the time-A little of the time-None of the time

Cut down on the amount of time you spent on work or other activities

Accomplished less than you would like

Did work or activities less carefully than usual

6. During the last 4 weeks to what extent has your physical health or emotional problems interfered with your normal social activities with friends, neighbors or groups?-Not at all-Slightly-Moderately-Quite a bit-Extremely

7. How much bodily pain have you had during the last 4 weeks?-None-Very Mild-Mild-Moderate-Severe-Very severe

.During the last 4 weeks, how much did pain interfere with your normal work?-Not at all-A little bit-Moderately-Quite a bit-Extremely

9. These are questions about how you feel and how things have been with you during the last 4 weeks. For each question please give the 1 answer that comes closest to the way you have been feeling. How much of the time during the last 4 weeks…

Did you feel full of life?

All of the time Most of the time Some of the time A little of the time None of the time

Have you been very nervous?

All of the time Most of the time Some of the time A little of the time None of the time

Have you felt so down in the dumps that nothing could cheer you up?

All of the time Most of the time Some of the time A little of the time None of the time

Have you felt calm and peaceful?

All of the time Most of the time Some of the time A little of the time None of the time

Did you have a lot of energy?

All of the time Most of the time Some of the time A little of the time None of the time

Have you felt downhearted and depressed?

All of the time Most of the time Some of the time A little of the time None of the time

Did you feel worn out?

All of the time Most of the time Some of the time A little of the time None of the time

Have you been happy?

All of the time Most of the time Some of the time A little of the time None of the time

Did you feel tired?

All of the time Most of the time Some of the time A little of the time None of the time

10. During the past 4 weeks how much of the timehas your physical health or emotional problemsinterfered with your social activities(like visiting friends, relatives, etc.)?

•All of the time•Most of the time•Some of the time•A little of the time•None of the time

11. How TRUE or FALSE is each of the following statements for you?

Definitely true Mostly true Don’t Know Mostly false Definitely false

I seem to get sick a little easier than other people

I am as healthy as anybody I know

I expect my health to get worse

My health is excellent

The SF-36 is calculated for 8 health factors (0-100)1. Physical limitations

2. Limitations in social activities

3. Limitations in work and home roles

4. Bodily pain

5. Psychological distress and wellbeing

6. Limitations because of emotional problems

7. Energy and fatigue

8. General health perceptions

Outcome: Mean SF-36 Score

(Mean score for Experimental Group Time1-Mean Score for Experimental Group Time 2)

minus(Mean score for Control Group Time1-Mean

Score for Control Group Time 2)

2 Measurements

Time 1 Assessment at Program Intake

Time 2 Measurement following Intervention

Outcome: Mean SF-36 Score

(Mean score for Experimental Group Time1-Mean Score for Experimental Group Time 2)

minus(Mean score for Control Group Time1-Mean

Score for Control Group Time 2)

Or 4 Measurements:Experimental Design

Experimental Group

Time 1 Assessment at Program

Intake

Time 2 Measurement following

Intervention

Control Group

Time 1 Assessment at Program

Intake

Time 2 Measurement following

Intervention