condition mean min max ZT0-3 3.4352543285 1.6389782730000002 5.231530384 ZT4-7 14.601551745 11.49745076 17.70565273 ZT8-11 15.592514575000001 15.359279480000001 15.82574967 ZT12-15 26.2289104775 23.64463123 28.813189725 ZT16-19 33.244572850000004 28.422926555 38.066219145000005 ZT20-23 60.996169214999995 54.364807875 67.62753055499999