condition mean min max ZT0-3 72.77801666666667 50.1851 87.852 ZT4-7 33.9656 33.9656 33.9656 ZT8-11 32.90715 32.90715 32.90715 ZT12-15 47.776875000000004 47.1679 48.38585 ZT16-19 55.012100000000004 55.012100000000004 55.012100000000004 ZT20-23 82.93979999999999 82.93979999999999 82.93979999999999