condition mean min max ZT0-3 8.69104754325 8.053464794 9.3286302925 ZT4-7 8.58661596875 7.26798483 9.9052471075 ZT8-11 12.46068241 11.11807933 13.803285489999999 ZT12-15 17.1264846425 14.50684107 19.746128215 ZT16-19 15.429932347500001 13.464809025000001 17.39505567 ZT20-23 24.5314588825 22.646384065 26.416533700000002