condition mean min max ZT0-3 5.28106 3.98984 6.572279999999999 ZT4-7 7.5887 7.5887 7.5887 ZT8-11 8.679285 8.679285 8.679285 ZT12-15 0 0 0 ZT16-19 9.919825 9.919825 9.919825 ZT20-23 7.883789999999999 7.883789999999999 7.883789999999999