condition mean min max ZT0-3 2.0999999999999996 2.0999999999999996 2.0999999999999996 ZT4-7 6.1 6.1 6.1 ZT8-11 6.25 6.25 6.25 ZT12-15 2.95 2.95 2.95 ZT16-19 3.65 3.65 3.65 ZT20-23 4.95 4.95 4.95