condition mean min max ZT0-3 30.65 30.65 30.65 ZT4-7 21.2 21.2 21.2 ZT8-11 13.25 13.25 13.25 ZT12-15 35.6 35.6 35.6 ZT16-19 26.45 26.45 26.45 ZT20-23 22.75 22.75 22.75