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CPH model of the effect of fluorescent reporter expression levels at 18 h posttransfection on neuronal survival
| Group | HR | 95% CI | P value |
| D2 (n = 212) | 1.0003 | 1.0002–1.0004 | <0.001*** |
| GFP (n = 220) | 1.0016 | 1.0009–1.0024 | <0.001*** |
| Ch (n = 225) | 0.9998 | 0.9996–1.0000 | 0.085 |
n, number of neurons.
