condition mean min max ZT0-3 4.6 4.6 4.6 ZT4-7 33.2 33.2 33.2 ZT8-11 7.15 7.15 7.15 ZT12-15 3.75 3.75 3.75 ZT16-19 15.2 15.2 15.2 ZT20-23 3.0999999999999996 3.0999999999999996 3.0999999999999996