condition mean min max ZT0-3 2993.8500000000004 2993.8500000000004 2993.8500000000004 ZT4-7 3284.8 3284.8 3284.8 ZT8-11 3337.25 3337.25 3337.25 ZT12-15 3509.5 3509.5 3509.5 ZT16-19 3633.5 3633.5 3633.5 ZT20-23 3274.05 3274.05 3274.05