condition mean min max ZT0-3 5.55358 5.55358 5.55358 ZT4-7 3.247775 3.247775 3.247775 ZT8-11 1.73103 1.73103 1.73103 ZT12-15 1.46902 1.46902 1.46902 ZT16-19 1.5071949999999998 1.5071949999999998 1.5071949999999998 ZT20-23 2.758615 2.758615 2.758615