condition mean min max ZT0-3 23.9 23.9 23.9 ZT4-7 37.5 37.5 37.5 ZT8-11 28.4 28.4 28.4 ZT12-15 26.150000000000002 26.150000000000002 26.150000000000002 ZT16-19 36.75 36.75 36.75 ZT20-23 57.8 57.8 57.8