condition mean min max ZT0-3 24.2 24.2 24.2 ZT4-7 1.7 1.7 1.7 ZT8-11 5.55 5.55 5.55 ZT12-15 5.2 5.2 5.2 ZT16-19 15.549999999999999 15.549999999999999 15.549999999999999 ZT20-23 3.3 3.3 3.3