condition mean min max ZT0-3 4.05 4.05 4.05 ZT4-7 4.7 4.7 4.7 ZT8-11 46.55 46.55 46.55 ZT12-15 13.299999999999999 13.299999999999999 13.299999999999999 ZT16-19 20.45 20.45 20.45 ZT20-23 14.5 14.5 14.5