condition mean min max ZT0-3 59.28863333333333 33.397400000000005 80.4948 ZT4-7 22.05435 22.05435 22.05435 ZT8-11 10.778485 10.778485 10.778485 ZT12-15 18.379925 17.530900000000003 19.228949999999998 ZT16-19 31.1961 31.1961 31.1961 ZT20-23 52.48765 52.48765 52.48765