condition mean min max ZT0-3 4546.98043 4546.98043 4546.98043 ZT4-7 5446.375789 5446.375789 5446.375789 ZT8-11 6646.3254855 6646.3254855 6646.3254855 ZT12-15 7176.3725615 7176.3725615 7176.3725615 ZT16-19 6818.549384 6818.549384 6818.549384 ZT20-23 8222.0000505 8222.0000505 8222.0000505