Hook size, style of hook, barbed, barbless, hook location in mouth, eye, tongue, gills, depth of water fish was hooked in, bait, hoochey, spoon, size of fish, length of fight, gaff, net, nylon net, rubber net, time held out of water, experience level of angler, crew, trolling , jigging, cut plugging, revival tank, size of boat ( distance fish must be lifted out of the water, water temp, time of year and I am sure I am missing a number of other variables.
Go ahead, tell me what the data was that you got and what correlations you got but don't insult my intelligence with "The science says...............................". That is just arrogance making statements like that IMO.
Studies have shown that blah blah blah is beneficial for CnR is fine but please leave science out of it.