condition mean min max ZT0-3 8.0494375 7.36608 8.732795 ZT4-7 4.917854999999999 4.917854999999999 4.917854999999999 ZT8-11 5.596185 5.596185 5.596185 ZT12-15 0 0 0 ZT16-19 12.44115 12.44115 12.44115 ZT20-23 13.04975 13.04975 13.04975