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Table 1 Adjectival 0–4 point scales for pain intensity, frequency of pain and frequency of impaired function

From: The index ‘Treatment Duration Control’ for enabling randomized controlled trials with variation in duration of treatment of chronic pain patients

Score value Intensity of pain Frequency of pain Frequency of impairment
0 no pain never painful never impairment
1 slight pain sometimes painful sometimes impairment
2 moderate pain regularly painful regularly impairment
3 severe pain often painful often impairment
4 extreme pain permanently painful permanently impairment