condition mean min max ZT0-3 0.7034391666666666 0.6140245 0.8172445 ZT4-7 0.2572425 0.2572425 0.2572425 ZT8-11 0.346843 0.346843 0.346843 ZT12-15 1.6970375 1.6965050000000002 1.6975699999999998 ZT16-19 1.2789549999999998 1.2789549999999998 1.2789549999999998 ZT20-23 1.38502 1.38502 1.38502