condition mean min max ZT0-3 27.226 17.771 33.24465 ZT4-7 13.611550000000001 13.611550000000001 13.611550000000001 ZT8-11 14.27685 14.27685 14.27685 ZT12-15 25.094974999999998 20.0549 30.13505 ZT16-19 26.9643 26.9643 26.9643 ZT20-23 30.70115 30.70115 30.70115