1907? Compare that to Ronald Fisher going to Rothamsted Experimental Station in 1919 and spending the next 14 years pioneering Biostatistics. Notice too that he is working on plants. There are no ethical concerns about doing randomized controlled trials on plants.
Medicine is much trickier. If an eminent doctor declares a medical treatment to be successful and others doubt, can the controversy be settled by a randomized controlled trial? That requires that the control group be deprived of a treatment that has the approval of an eminent doctor. Tradition views that as unethical and forbidden.
The next big date is 1972 and the publication of Effectiveness and Efficiency: Random Reflections on Health Services. Archie Cochrane moved things along with straight talk about how few medical treatments actually worked. Trusting eminent doctors had been tried and failed. It was time for randomized controlled trials to be used, not just for proposed new treatments, but to review old treatments that some doubted.
But returning to 1907, one notes that Archie Cochrane was born in 1909. The man who persuaded the world that biostatistics was for medicine, not just plants, wasn't born yet.
Dismantling the state "asylum" system in the 1970's looks poorly timed in retrospect. The mentally ill end up missing out on the transition from eminence based medicine to evidence based medicine. Too late to go back and fix it; we've moved on to money based medicine :-(