condition mean min max ZT0-3 0.2294861575 0.064881989 0.39409032600000005 ZT4-7 1.4005113775 0.9576962579999999 1.843326497 ZT8-11 2.7216690124999996 2.362723235 3.08061479 ZT12-15 3.5733064587500003 2.7348653965 4.411747521000001 ZT16-19 1.54048321725 1.502119433 1.5788470015 ZT20-23 1.985390102 1.9475580030000001 2.023222201