condition mean min max ZT0-3 5.6 5.6 5.6 ZT4-7 1.8 1.8 1.8 ZT8-11 9.649999999999999 9.649999999999999 9.649999999999999 ZT12-15 7.55 7.55 7.55 ZT16-19 4.4 4.4 4.4 ZT20-23 5.65 5.65 5.65