condition mean min max ZT0-3 80.360584 80.360584 80.360584 ZT4-7 54.246924500000006 54.246924500000006 54.246924500000006 ZT8-11 54.6140645 54.6140645 54.6140645 ZT12-15 49.225862 49.225862 49.225862 ZT16-19 42.9732855 42.9732855 42.9732855 ZT20-23 40.2894025 40.2894025 40.2894025