condition mean min max ZT0-3 26.34535 24.9298 27.7609 ZT4-7 27.7847 27.7847 27.7847 ZT8-11 29.0336 29.0336 29.0336 ZT12-15 0 0 0 ZT16-19 25.044449999999998 25.044449999999998 25.044449999999998 ZT20-23 21.7526 21.7526 21.7526