condition mean min max ZT0-3 53.648983333333334 26.448050000000002 75.42185 ZT4-7 15.27595 15.27595 15.27595 ZT8-11 10.921975 10.921975 10.921975 ZT12-15 41.71155 31.0135 52.4096 ZT16-19 32.23875 32.23875 32.23875 ZT20-23 53.6546 53.6546 53.6546