condition mean min max ZT0-3 22.55 22.55 22.55 ZT4-7 2.6 2.6 2.6 ZT8-11 4.25 4.25 4.25 ZT12-15 25.200000000000003 25.200000000000003 25.200000000000003 ZT16-19 15.4 15.4 15.4 ZT20-23 17.15 17.15 17.15