condition mean min max ZT0-3 74.98335 42.562200000000004 95.80915 ZT4-7 55.64215 55.64215 55.64215 ZT8-11 49.775800000000004 49.775800000000004 49.775800000000004 ZT12-15 46.603350000000006 40.745000000000005 52.4617 ZT16-19 66.9435 66.9435 66.9435 ZT20-23 89.6713 89.6713 89.6713