condition mean min max ZT0-3 25.82285 25.82285 25.82285 ZT4-7 22.59055 22.59055 22.59055 ZT8-11 16.1888 16.1888 16.1888 ZT12-15 19.9527 19.9527 19.9527 ZT16-19 47.5299 47.5299 47.5299 ZT20-23 28.23855 28.23855 28.23855