condition mean min max ZT0-3 70.722282 70.722282 70.722282 ZT4-7 57.180589499999996 57.180589499999996 57.180589499999996 ZT8-11 66.574043 66.574043 66.574043 ZT12-15 63.578714500000004 63.578714500000004 63.578714500000004 ZT16-19 68.555295 68.555295 68.555295 ZT20-23 68.024704 68.024704 68.024704