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Table 2 Correlation coefficients showing the correlation between various item scores and between item scores and total scale score of PHQ-9

From: The reliability and validity of PHQ-9 in patients with major depressive disorder in psychiatric hospital

  Item-1 Item-2 Item-3 Item-4 Item-5 Item-6 Item-7 Item-8 Item-9
Item-1 1.000
Item-2 0.660** 1.000
Item-3 0.434** 0.475** 1.000
Item-4 0.638** 0.531** 0.586** 1.000
Item-5 0.365** 0.354** 0.419** 0.450** 1.000
Item-6 0.566** 0.747** 0.423** 0.462** 0.387** 1.000
Item-7 0.608** 0.601** 0.426** 0.571** 0.382** 0.644** 1.000
Item-8 0.558** 0.556** 0.369** 0.503** 0.245* 0.549** 0.599** 1.000
Item-9 0.387** 0.527** 0.233* 0.268** 0.299** 0.513** 0.426** 0.438** 1.000
Total scores 0.789** 0.787** 0.647** 0.743** 0.567** 0.788** 0.769** 0.684** 0.569**
  1. PHQ-9 Patient Health Questionnaire
  2. **P < 0.01 *P < 0.05