condition mean min max ZT0-3 35.95258333333334 31.67335 38.27635 ZT4-7 30.30065 30.30065 30.30065 ZT8-11 16.28505 16.28505 16.28505 ZT12-15 24.36655 23.5253 25.2078 ZT16-19 31.5866 31.5866 31.5866 ZT20-23 45.91185 45.91185 45.91185