condition mean min max ZT0-3 1.97404985475 1.675548901 2.2725508085 ZT4-7 2.329188335 2.0720681069999998 2.5863085630000002 ZT8-11 5.034812416499999 4.510307013 5.5593178199999995 ZT12-15 6.0208288285 5.44187184 6.599785817 ZT16-19 7.79739083625 5.6765799144999995 9.918201758 ZT20-23 12.937157534999999 12.434113589999999 13.440201479999999