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Table 1 Item means and item-rest correlations for ISS items

From: Unpacking the impact of chronic pain as measured by the impact stratification score

Items M(SD) Item-total correlation
Physical Function
 1. Are you able to do chores such as vacuuming or yard work? (1–5) 2.1 (0.97) 0.68
 2. Are you able to go up and down stairs at a normal pace? (1–5) 1.9 (0.98) 0.65
 3. Are you able to go for a walk of at least 15 min? (1–5) 1.6 (0.90) 0.65
 4. Are you able to run errands and shop? (1–5) 1.6 (0.78) 0.73
Pain Interference
 5. How much did pain interfere with your day-to-day activities? (1–5) 2.3 (0.94) 0.79
 6. How much did pain interfere with work around the home? (1–5) 2.3 (1.02) 0.84
 7. How much did pain interfere with your ability to participate in social activities? (1–5) 1.8 (1.00) 0.76
 8. How much did pain interfere with your household chores? (1–5) 2.1 (1.01) 0.82
Pain Intensity
 9. How would you rate your pain on average? (0–10) 3.9 (2.05) 0.64
  1. Cronbach’s α = 0.93