condition mean min max ZT0-3 19.059253333333334 13.66876 23.3519 ZT4-7 14.177950000000001 14.177950000000001 14.177950000000001 ZT8-11 14.5999 14.5999 14.5999 ZT12-15 21.191475 17.5113 24.871650000000002 ZT16-19 40.540949999999995 40.540949999999995 40.540949999999995 ZT20-23 46.8735 46.8735 46.8735