condition mean min max ZT0-3 1.4805416666666666 0.61829 2.30516 ZT4-7 0.6635555 0.6635555 0.6635555 ZT8-11 1.0769099999999998 1.0769099999999998 1.0769099999999998 ZT12-15 2.496335 2.3661950000000003 2.626475 ZT16-19 2.45365 2.45365 2.45365 ZT20-23 3.735315 3.735315 3.735315