condition mean min max ZT0-3 40.635591 40.635591 40.635591 ZT4-7 55.560582499999995 55.560582499999995 55.560582499999995 ZT8-11 50.611976999999996 50.611976999999996 50.611976999999996 ZT12-15 34.922733 34.922733 34.922733 ZT16-19 21.541533 21.541533 21.541533 ZT20-23 17.3544855 17.3544855 17.3544855