condition mean min max ZT0-3 23.438225 22.378349999999998 24.4981 ZT4-7 18.673650000000002 18.673650000000002 18.673650000000002 ZT8-11 30.1 30.1 30.1 ZT12-15 0 0 0 ZT16-19 30.956699999999998 30.956699999999998 30.956699999999998 ZT20-23 23.3437 23.3437 23.3437