The sum of specific health problem impairment and impairment due to other health reasons is equal to impairment due to all health reasons. WPAI outcomes are expressed as impairment percentages, with higher numbers indicating greater impairment and less productivity, i.e., worse outcomes, as follows:

1 = currently employed

2a = hours missed due to specified problem

2b = hours missed due to other health problems

2c = hours missed other reasons

3 = hours actually worked

4a = degree problem affected productivity while working

4b = degree other health problems affected productivity while working

5a = degree problem affected regular activities

5b = degree other health problems affected regular activities

Multiply scores by 100 to express in percentages.

Percent work time missed due to problem: Q2a/(Q2a+Q2b+Q3)

Percent impairment while working due to problem: Q4a/10

Percent overall work impairment due to problem:

Q2a/(Q2a+Q2b+Q3) + {(1-(Q2a+Q2b)/(Q2a+Q2b+Q3)) x Q4a/10

Percent activity impairment due to problem: Q5a/10

Percent work time missed due to all health: (Q2a+Q2b)/(Q2a+Q2b+Q3)

Percent impairment while working due to all health: (Q4a+Q4b)/10

Percent overall work impairment due to all health:

(Q2a+Q2b)/(Q2a+Q2b+Q3) + {(1-(Q2a+Q2b)/(Q2a+Q2b+Q3)) x (Q4a+Q4b)/10

Percent activity impairment due to all health: (Q5a+Q5b)/10

WPAI outcomes are expressed as impairment percentages, with higher numbers indicating greater impairment and less productivity, i.e., worse outcomes, as follows:

1 = currently employed

2 = hours missed due to health problems

3 = hours missed other reasons

4 = hours actually worked

5 = degree health affected productivity while working

6 = degree health affected regular activities

Multiply scores by 100 to express in percentages.

Percent work time missed due to health: Q2/(Q2+Q4)

Percent impairment while working due to health: Q5/10

Percent overall work impairment due to health:

Q2/(Q2+Q4)+[(1-(Q2/(Q2+Q4)))x(Q5/10)]

Percent activity impairment due to health: Q6/10

WPAI outcomes are expressed as impairment percentages, with higher numbers indicating greater impairment and less productivity, i.e., worse outcomes, as follows:

1 = currently employed

2 = hours missed due to specified problem

3 = hours missed other reasons

4 = hours actually worked

5 = degree problem affected productivity while working

6 = degree problem affected regular activities

Multiply scores by 100 to express in percentages.

Percent work time missed due to problem: Q2/(Q2+Q4)

Percent impairment while working due to problem: Q5/10

Percent overall work impairment due to problem:

Q2/(Q2+Q4)+[(1-(Q2/(Q2+Q4)))x(Q5/10)]

Percent activity impairment due to problem: Q6/10

WPAI outcomes are expressed as impairment percentages, with higher numbers indicating greater impairment and less productivity, i.e., worse outcomes, as follows:

1 = currently employed

2 = hours usually work

3 = hours missed due to allergy

4 = degree allergy affected productivity while working

5 = currently student

6 = hours usually attend class

7 = hours class time missed due to allergy

8 = degree allergy affected productivity while working

9 = degree allergy affected regular activities

Multiply scores by 100 to express in percentages.

Percent work time missed due to allergy: Q3/Q2

Percent impairment while working due to allergy: Q4/10

Percent overall work impairment due to allergy: (Q3/Q2)+[(1-(Q3/Q2))x(Q4/10)]

Percent class time missed due to allergy: Q7/Q6

Percent impairment in the classroom due to allergy: Q8/10

Percent overall classroom impairment due to allergy: (Q7/Q6)+[(1-(Q7/Q6))x(Q8/10)]

Percent activity impairment due to allergy: Q9/10

The WPAI yeilds four types of scores:

1. Absenteeism (work time missed)

2. Presenteesism (impairment at work / reduced on-the-job effectiveness)

3. Work productivty loss (overall work impairment / absenteeism plus presenteeism)

4. Activity Impairment