condition mean min max ZT0-3 3.0999999999999996 3.0999999999999996 3.0999999999999996 ZT4-7 2.6 2.6 2.6 ZT8-11 2.55 2.55 2.55 ZT12-15 9.3 9.3 9.3 ZT16-19 5.05 5.05 5.05 ZT20-23 3.15 3.15 3.15