condition mean min max ZT0-3 33.48528333333333 30.30815 37.90895 ZT4-7 28.362000000000002 28.362000000000002 28.362000000000002 ZT8-11 31.7012 31.7012 31.7012 ZT12-15 40.10415 36.9357 43.2726 ZT16-19 37.2748 37.2748 37.2748 ZT20-23 36.234449999999995 36.234449999999995 36.234449999999995