From the 2008 National Health Interview Survey:
The next questions ask about difficulties you may have doing certain activities because of a HEALTH PROBLEM. By "health problem" we mean any physical, mental, or emotional problem or illness (not including pregnancy).
By yourself, and without using any special equipment, how difficult is it for you to:
walk up ten steps without resting?
- Not at all difficult
- Only a little difficult
- Somewhat difficult
- Very difficult
- Can't do at all
- Do not do this activity
- Don't know
[NUMERATOR AND DENOMINATOR:]
Have you EVER been told by a doctor or other health professional that you have some form of arthritis, rheumatoid arthritis, gout, lupus, or fibromyalgia?