condition mean min max ZT0-3 2635.65 2635.65 2635.65 ZT4-7 2453.0 2453.0 2453.0 ZT8-11 2360.35 2360.35 2360.35 ZT12-15 2479.6 2479.6 2479.6 ZT16-19 2319.8500000000004 2319.8500000000004 2319.8500000000004 ZT20-23 2546.75 2546.75 2546.75