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Table 2 Association between PHQ-9 depression score and SF-12 health related quality of life scores, sick days and number of consultations in the past 12 months.

From: The Patient Health Questionnaire-9 for detection of major depressive disorder in primary care: consequences of current thresholds in a crosssectional study

  Level of depression severity (PHQ-9 score)
  Minimal
(0-4)
Mild
(5-9)
Moderate
(10-14)
Moderately severe
(15-19)
Severe
(20-27)
p-value2
Physical functioning, Median (IQR1) 50 (42-54) 47 (38-54) 47 (38-57) 41 (34-52) 42 (39-50) 0.00
Mental functioning, Median (IQR) 54 (49-57) 42 (33-49) 30 (25-36) 26 (21-34) 21 (17-28) 0.00
Sick days, median (IQR) 0 (0-4) 1 (0-7) 6 (0-15) 7 (2-20) 8 (1-15) 0.00
Consultations in previous 12 months, Median (IQR) 9 (5-15) 11 (6-17) 14 (8-22) 16 (7-27) 12 (9-25) 0.00
  1. 1IQR - Interquartile range
  2. 2 P-values from Kruskal-Wallis tests