Fig 1. Distribution of happiness ratings in three symptom severity subgroups (N = 2411).
Normal/Mild subgroup: mean (sd) = 7.3 (1.2), range 1–10; Moderate subgroup: mean (sd) = 5.7 (1.8), range 0–9; Severe subgroup: mean (sd) = 4.2 (2.2), range 0–9.
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