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Absence is easy to measure — someone is either at work or they are not. The Work Limitations Questionnaire exists because that measurement misses most of what ill health actually costs, which happens on the days people come in anyway and get through perhaps two thirds of a day's work.
In short
- Developed by Lerner and colleagues, published in 2001 in Medical Care.
- 25 items across four scales: time management, physical demands, mental–interpersonal demands, and output demands.
- Produces a WLQ Index estimating productivity loss as a percentage.
- Measures presenteeism — reduced capacity while present — rather than absence.
- Copyrighted and licensed by Tufts Medical Center; use requires permission.
The problem it was built for#
Occupational health research spent decades measuring absenteeism because absenteeism is countable. Then a series of studies established something awkward: for most chronic conditions, the productivity lost while people are at work substantially exceeds the productivity lost to their being away.
This is presenteeism. Migraine, depression, arthritis, allergy and chronic pain rarely stop someone attending. They stop someone concentrating, sustaining effort, handling difficult conversations, or finishing what they started — none of which appears in an attendance record.
Turning up is not the same as being able to work, and only one of the two is easy to count.
The four scales#
The WLQ asks how much difficulty a person had performing specific categories of job demand over a recent period. Its 25 items resolve into four scales.
| Scale | What it covers |
|---|---|
| Time management | Handling schedules, starting on time, working a required period without breaks |
| Physical demands | Bodily capacity for the work — strength, endurance, movement, repetition |
| Mental–interpersonal demands | Concentration, focus, decision-making, and dealing with people |
| Output demands | Quantity and quality of work finished, and working without additional errors |
The mental–interpersonal scale is the one that matters most for anything psychological. It is where reduced concentration and depleted interpersonal capacity are recorded — the two limitations that most reliably follow low mood and high caregiving load, and the two that colleagues notice long before anyone names them.
How it is scored#
Items are answered on a difficulty or time-based response scale referring to a recent window, typically the past two weeks. Each of the four scales is scored separately, and the scale scores can be combined into a WLQ Index — an estimate of productivity loss expressed as a percentage relative to a healthy benchmark.
The percentage framing is what made the instrument travel beyond clinical research: it converts a health state into a figure that appears on a spreadsheet, which is what allowed the cost of untreated conditions to be argued in terms employers respond to.
- WLQ-25 — the full instrument.
- WLQ-16 and WLQ-8 — shorter forms for repeated administration and large surveys.
Licensing#
Limits worth knowing#
- It assumes a job with legible demands. The scales fit structured roles better than fragmented, self-directed or unpaid work.
- Unpaid labour is invisible to it. Caring, domestic and community work are real output that the WLQ was never designed to see — a gap it shares with almost every productivity instrument. See the Zarit Burden Interview for the measure that does cover caring.
- Self-assessed productivity is imprecise. People are not reliable estimators of their own output, in either direction.
- Employer framing shapes answers. The same person answers differently depending on who they believe is reading, which is a serious constraint on workplace deployment.
Who the measurement is for#
Worth being clear-eyed about: the WLQ was built to quantify what a worker's health costs an employer. That framing is not hidden — the output is a productivity-loss percentage, and the audience for that figure is the organisation, not the person who filled in the questionnaire.
This is what made the instrument effective. Converting a health state into a number that appears on a spreadsheet is what got employers to fund treatment for conditions they had previously ignored, and a great many people benefited from that.
It also explains the instrument's sharpest limitation. The same person answers differently depending on who they believe is reading — and someone who suspects their answers will reach a manager has every reason to under-report. A measure of how much work is costing you and a measure of how much you are costing your employer look identical on paper and are not the same question.
Any self-report instrument is partly a measure of who the respondent thinks is listening.
Common questions#
- What is the Work Limitations Questionnaire?
- The Work Limitations Questionnaire is a 25-item instrument measuring how much health problems limit a person's ability to perform their job. It covers four scales — time management, physical demands, mental-interpersonal demands and output demands — and produces a WLQ Index estimating productivity loss as a percentage.
- What is presenteeism?
- Presenteeism is reduced productivity while a person is at work, as opposed to absenteeism, which is productivity lost to being away. For many chronic conditions, presenteeism accounts for a larger share of total lost productivity than absence does.
- Is the Work Limitations Questionnaire free to use?
- No. The WLQ is copyrighted by Tufts Medical Center and distributed under licence. Reproducing its items or embedding it in a product requires permission from the rights holder.
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