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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Compr Psychiatry. 2015 Aug 15;63:30–35. doi: 10.1016/j.comppsych.2015.08.007

Table 2.

Y-BOCS Classification of CGI-Severity Ratings Based on Ordinal Logistic Regression

Y-BOCS Range CGI-Severity Rating
0–13a,b Mild symptoms or less (Little to no functional impairment); CGI-Severity = 0 to 2
14–25 Moderate symptoms (Functions with effort); CGI-Severity = 3
26–34 Moderate-severe symptom (Limited functioning); CGI-Severity = 4
35–40b Severe or greater symptoms (Functions with assistance or completely non- functional); CGI-Severity = 5 to 6

Note. Y-BOCS = Yale Brown Obsessive Compulsive Scale; CGI-Severity = Clinical Global Impressions-Severity

a

Because a clinical sample was employed, no Y-BOCS scores below 7 were available for use. It was assumed that scores below 7 would follow the predictions made by the ordinal logistic model for patients with very mild symptoms, and thus we included scores below 7 in the Y-BOCS range, resulting in a range of 0–13.

b

The ordinal logistic model employed only predicted CGI-Severity scores in the range of 2 to 5. This is due to the nature of an outpatient clinical sample, which has relatively few participants in these extreme CGI-Severity ranges, as well the CGI-Severity possibly not discriminating as well at very high and very low extremes of its measurement range. It was assumed that a predicted score of 5 would mean that CGI-Severity scores of greater severity would also be incorporated in this range, and similarly a predicted score of 2 would also incorporate CGI-Severity scores of lesser severity.