condition mean min max ZT0-3 2.3 2.3 2.3 ZT4-7 3.1 3.1 3.1 ZT8-11 12.3 12.3 12.3 ZT12-15 9.2 9.2 9.2 ZT16-19 9.25 9.25 9.25 ZT20-23 3.3499999999999996 3.3499999999999996 3.3499999999999996