condition mean min max ZT0-3 14.9 14.9 14.9 ZT4-7 2.2 2.2 2.2 ZT8-11 3.3499999999999996 3.3499999999999996 3.3499999999999996 ZT12-15 2.6 2.6 2.6 ZT16-19 4.15 4.15 4.15 ZT20-23 5.0 5.0 5.0