condition mean min max ZT0-3 272.25 272.25 272.25 ZT4-7 59.9 59.9 59.9 ZT8-11 76.5 76.5 76.5 ZT12-15 125.55000000000001 125.55000000000001 125.55000000000001 ZT16-19 220.75 220.75 220.75 ZT20-23 248.55 248.55 248.55