condition mean min max ZT0-3 28.15 28.15 28.15 ZT4-7 27.8 27.8 27.8 ZT8-11 25.5 25.5 25.5 ZT12-15 15.299999999999999 15.299999999999999 15.299999999999999 ZT16-19 17.55 17.55 17.55 ZT20-23 19.2 19.2 19.2