Table 2. Concordance Between Indications of Suicidal Ideation According to the Specified Source* and Indications According to International Classification of Diseases, 9th Revision, Codes
HPI (n = 15,761)PHQ-9 (n = 1,013)HPI or PHQ-9 (n = 16,289)Both HPI and PHQ-9 (n = 485)
Suicidal ideation indicated by specified source1,025 (6.5)85 (8.4)1,098 (6.7)12 (2.5)
    Corresponding ICD-9 code included30 (3)4 (5)34 (3.1)0 (0)
    κ Statistic0.0360.0680.04
  • Data are n (%).

  • * Source corresponds to the column headings: history of present illness [HPI] notes field; item 9 of the 9-item Patient Health Questionnaire [PHQ-9]; HPI notes field or PHQ-9 item 9; both the HPI notes field and PHQ-9 item 9.

  • ICD-9, International Classification of Diseases, 9th Revision.