condition mean min max ZT0-3 0.369595 0.0 0.73919 ZT4-7 0.727505 0.727505 0.727505 ZT8-11 0.7405619999999999 0.7405619999999999 0.7405619999999999 ZT12-15 0 0 0 ZT16-19 0.362343 0.362343 0.362343 ZT20-23 0.3664195 0.3664195 0.3664195