condition mean min max ZT0-3 5.8999999999999995 5.8999999999999995 5.8999999999999995 ZT4-7 2.9 2.9 2.9 ZT8-11 1.9 1.9 1.9 ZT12-15 1.3499999999999999 1.3499999999999999 1.3499999999999999 ZT16-19 14.4 14.4 14.4 ZT20-23 1.3 1.3 1.3