condition mean min max ZT0-3 7.775341924000001 7.722455577000001 7.828228271 ZT4-7 10.2485590725 8.902382395 11.59473575 ZT8-11 7.91143367925 6.995557585 8.8273097735 ZT12-15 16.77401258 15.72599021 17.822034950000003 ZT16-19 28.95744351 22.82573663 35.08915039 ZT20-23 50.4126888975 42.869631209999994 57.955746585