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asynchronous session video for Module 1C: Kaplan-Meier survival analysis to be able to solve this. A clinical trial was conducted to test the efficacy of different vitamin supplements in preventing visual loss in patients with retinitis pigmentosa (RP). Visual loss was measured by loss of retinal function as characterized by a 50% decline in the electroretinogram (ERG) 30 Hz amplitude, a measure of the electrical activity in the retina. In normal people, the normal range for ERG 30 Hz amplitude is >50 uV. In patients with RP, ERG 30 Hz amplitude is usually