condition mean min max ZT0-3 52.324295 52.324295 52.324295 ZT4-7 45.0054905 45.0054905 45.0054905 ZT8-11 47.1632075 47.1632075 47.1632075 ZT12-15 45.065816999999996 45.065816999999996 45.065816999999996 ZT16-19 89.433458 89.433458 89.433458 ZT20-23 95.9754695 95.9754695 95.9754695