condition mean min max ZT0-3 3.4517234375 2.6587229930000005 4.244723882 ZT4-7 2.86821636325 2.4420605635 3.2943721630000002 ZT8-11 4.420350368499999 3.7179455714999996 5.122755165499999 ZT12-15 5.18483205975 4.7211234715 5.648540647999999 ZT16-19 6.219768037250001 4.8353259355 7.604210139000001 ZT20-23 11.67160188725 9.5144251245 13.82877865