condition mean min max ZT0-3 33.25 33.25 33.25 ZT4-7 5.7 5.7 5.7 ZT8-11 68.85 68.85 68.85 ZT12-15 25.8 25.8 25.8 ZT16-19 28.6 28.6 28.6 ZT20-23 23.849999999999998 23.849999999999998 23.849999999999998