condition mean min max ZT0-3 1370.373065 1370.373065 1370.373065 ZT4-7 1941.395903 1941.395903 1941.395903 ZT8-11 2058.4668495 2058.4668495 2058.4668495 ZT12-15 2385.5690505000002 2385.5690505000002 2385.5690505000002 ZT16-19 3116.749209 3116.749209 3116.749209 ZT20-23 3283.1191945 3283.1191945 3283.1191945