condition mean min max ZT0-3 7.45 7.45 7.45 ZT4-7 0.6 0.6 0.6 ZT8-11 15.649999999999999 15.649999999999999 15.649999999999999 ZT12-15 5.3 5.3 5.3 ZT16-19 3.45 3.45 3.45 ZT20-23 1.0 1.0 1.0