condition mean min max ZT0-3 19.5 19.5 19.5 ZT4-7 12.8 12.8 12.8 ZT8-11 14.35 14.35 14.35 ZT12-15 20.2 20.2 20.2 ZT16-19 25.65 25.65 25.65 ZT20-23 12.549999999999999 12.549999999999999 12.549999999999999