Why is it difficult to determine estimates of how many people are afflicted with lifelong chronic pain?

A. Sufferers often do not report their experience.
B. The census does not usually include data on chronic pain sufferers.
C. Studies usually include different populations and use different criteria for determining what is chronic pain.
D. Recovery rates among chronic pain sufferers are so sporadic that it is difficult to keep up with the correct estimates.


Answer: C

Psychology

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