condition mean min max ZT0-3 8.187640157250001 7.700003450500001 8.675276864 ZT4-7 11.321434111833334 9.580383900333333 13.062484323333333 ZT8-11 12.306381757166665 11.188910214333333 13.4238533 ZT12-15 12.024287155 11.7422468 12.306327510000001 ZT16-19 13.77770494 13.145155279999999 14.4102546 ZT20-23 12.409034340000002 10.830138680000001 13.98793