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Table 2 PHQ-based prevalence and comorbidity

From: Utility of the PHQ-9 to identify major depressive disorder in adult patients in Spanish primary care centres

  Total sample of PHQ respondents (n = 260) Subsample of PHQ and SCID-I respondents (n = 178)
  n % n %
Somatoform disorder (SD)
 SD (≤ 5) 141 54.2 94 52.8
Major depressive disorder (MDD)
 MDD (Algorithm) 178 68.5 124 69.7
 MDD (≤ 10) 203 78.1 138 77.5
Panic disorder (PD)
 PD (Original Algorithm)a 57 21.9 40 22.5
 PD (Modified Algorithm)b 110 42.3 74 41.6
General anxiety disorder (GAD)
 GAD (≤ 10) 180 69.2 128 71.9
Eating disorder
 (PHQ Algorithm) 45 17.3 30 16.9
Alcohol abuse
 (PHQ Algorithm) 38 14.6 25 14.0
Comorbidity
 MDD + GAD 150 57.7 107 60.1
 MDD + SD 115 44.2 81 45.5
 GAD + SD 117 45.0 81 45.5
 MDD + GAD + SD 104 40.0 74 41.6
 GAD + PD 45 17.3 33 18.5
 MDD + PD 40 15.4 30 16.9
 MDD + GAD + PD 37 14.2 29 16.3
 PD + SD 42 16.2 27 15.2
 SD + GAD + PD 36 13.8 25 14.0
 MDD + SD + PD 34 13.1 23 12.9
SD + MDD + PD + GAD 32 12.3 22 12.4
SD + MDD + PD + GAD 1 0.4 1 0.3
+ Eating + Alcohol     
  1. Note: SD somatoform disorder, MDD major depressive disorder, PD panic disorder, GAD general anxiety disorder, Eating eating disorder, Alcohol alcohol abuse. Comorbidity categories are not exclusive (e.g., “MDD + GAD” comprises “MDD + GAD + SD”)
  2. aOriginal Algorithm: All of the first four questions are answered with “yes,” and presence of four or more somatic symptoms during an anxiety attack
  3. bModified Algorithm: At least two of the first four questions are answered with “yes,” other coding criteria unchanged. (See Muñoz-Navarro et al. for more details; [35])