condition mean min max ZT0-3 11.620383333333333 10.5546 12.28975 ZT4-7 31.59935 31.59935 31.59935 ZT8-11 20.97025 20.97025 20.97025 ZT12-15 23.005200000000002 18.06495 27.94545 ZT16-19 12.4082 12.4082 12.4082 ZT20-23 12.81515 12.81515 12.81515