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PHQ-9: Patient Health Questionnaire-9
| 2016 | 2017 | 2018 | |
| Correlation | Correlation | Correlation | |
| Male | -0.221 | 0.026 | 0.026 |
| (0.216) | (0.888) | (0.887) | |
| 2016 | 2017 | 2018 | |
| Correlation | Correlation | Correlation | |
| Female | -0.133 | -0.212 | 0.085 |
| (0.518) | (0.298) | (0.679) |
