condition mean min max ZT0-3 1.90505 1.8770699999999998 1.93303 ZT4-7 1.762495 1.762495 1.762495 ZT8-11 1.59386 1.59386 1.59386 ZT12-15 0 0 0 ZT16-19 1.9272 1.9272 1.9272 ZT20-23 2.6366899999999998 2.6366899999999998 2.6366899999999998