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| Rat group | ZDF | ZL |
| Expected melatonin level from immobility time | y = 4.832−0.0130x R = −0.544 | y = 3.465+0.00752x R = 0.245 |
| Expected immobility time from melatonin level | y = 152.57−22.766x R = −0.544 | y = 9.481+7.958x R = 0.245 |
