condition mean min max ZT0-3 4.199999999999999 4.199999999999999 4.199999999999999 ZT4-7 3.4 3.4 3.4 ZT8-11 3.3499999999999996 3.3499999999999996 3.3499999999999996 ZT12-15 3.0 3.0 3.0 ZT16-19 5.35 5.35 5.35 ZT20-23 4.05 4.05 4.05