condition mean min max ZT0-3 7.8999999999999995 7.8999999999999995 7.8999999999999995 ZT4-7 7.4 7.4 7.4 ZT8-11 13.05 13.05 13.05 ZT12-15 4.9 4.9 4.9 ZT16-19 3.3499999999999996 3.3499999999999996 3.3499999999999996 ZT20-23 23.099999999999998 23.099999999999998 23.099999999999998