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. 2019 Jul 19;14(7):e0219902. doi: 10.1371/journal.pone.0219902

Fig 4. Frequent pain medication users (prevalence, %) by HRQoL trajectory groups.

Fig 4

Pooled answers regarding the use of strong pain medications, acetaminophen and nonsteroidal anti-inflammatory drugs. Answers were dichotomized (frequent pain medication user / nonuser of pain medication). HRQoL change (MIC, a minimally important reduction in KOOS QoL) trajectory groups: no change in KOOS QoL (green line); improving KOOS QoL after decline (blue line); slowly worsening KOOS QoL (yellow line); rapidly worsening KOOS QoL (red line).