condition mean min max ZT0-3 27.4694 27.4694 27.4694 ZT4-7 32.04785 32.04785 32.04785 ZT8-11 23.5666 23.5666 23.5666 ZT12-15 19.77255 19.77255 19.77255 ZT16-19 23.92575 23.92575 23.92575 ZT20-23 29.13125 29.13125 29.13125