condition mean min max ZT0-3 15.049999999999999 15.049999999999999 15.049999999999999 ZT4-7 57.9 57.9 57.9 ZT8-11 13.35 13.35 13.35 ZT12-15 44.25 44.25 44.25 ZT16-19 23.3 23.3 23.3 ZT20-23 23.45 23.45 23.45