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Table 2 Reliability of PHQ-9

From: The validity and reliability of the Patient Health Questionnaire-9 for screening depression in primary health care patients in Botswana

PHQ-9 ItemsPHQ-9 QuestionsScale Mean if Item DeletedCorrected Item-Total CorrelationCronbach’s Alpha if Item DeletedItems
Mean ± SD
PHQ-1Little interest or fun in doing things7.800.5400.7730.90 ± 1.08
PHQ-2Feeling down, depressed or hopeless7.340.6020.7641.36 ± 1.17
PHQ-3Trouble falling asleep, staying asleep or sleeping too much7.440.4840.7811.26 ± 1.23
PHQ-4Feeling tired or having little energy7.620.4560.7841.08 ± 1.15
PHQ-5Poor appetite or overeating7.660.4940.7791.04 ± 1.19
PHQ-6Feeling bad about yourself, or that you’re a failure or have let yourself or your family down7.570.4560.7841.13 ± 1.15
PHQ-7Trouble concentrating on things such as reading the newspaper or watching television7.680.5220.7751.02 ± 1.11
PHQ-8Moving or speaking so slowly that other people could have noticed. Or the opposite8.150.4040.7900.55 ± 0.97
PHQ-9Thoughts that you would be better off dead or hurting yourself in some way8.330.4660.7840.37 ± 0.82
OverallCronbach’s Alpha0.7998.65 ± 6.1