condition mean min max ZT0-3 12.45 12.45 12.45 ZT4-7 23.4 23.4 23.4 ZT8-11 2.65 2.65 2.65 ZT12-15 10.299999999999999 10.299999999999999 10.299999999999999 ZT16-19 4.35 4.35 4.35 ZT20-23 12.75 12.75 12.75