condition mean min max ZT0-3 0.6068458333333333 0.4730445 0.6934405 ZT4-7 0.904416 0.904416 0.904416 ZT8-11 0.7673085 0.7673085 0.7673085 ZT12-15 1.78441 1.7704550000000001 1.798365 ZT16-19 1.080585 1.080585 1.080585 ZT20-23 0.556906 0.556906 0.556906