condition mean min max ZT0-3 6.4609014525 5.499506853 7.422296052 ZT4-7 5.434260815749999 5.1321147924999995 5.736406839 ZT8-11 5.79313736975 5.4082507035 6.178024036 ZT12-15 4.23344934175 3.710145355 4.7567533285 ZT16-19 3.12406341275 3.0504891245 3.197637701 ZT20-23 3.3623163025000005 3.0440713180000003 3.6805612870000006