condition mean min max ZT0-3 12.292200000000001 12.292200000000001 12.292200000000001 ZT4-7 14.576 14.576 14.576 ZT8-11 7.237375 7.237375 7.237375 ZT12-15 7.158625000000001 7.158625000000001 7.158625000000001 ZT16-19 7.695813333333333 7.695813333333333 7.695813333333333 ZT20-23 11.8916 11.8916 11.8916