condition mean min max ZT0-3 13.510871666666667 8.828015 16.098399999999998 ZT4-7 10.605599999999999 10.605599999999999 10.605599999999999 ZT8-11 35.7666 35.7666 35.7666 ZT12-15 32.744625 29.12375 36.3655 ZT16-19 23.615000000000002 23.615000000000002 23.615000000000002 ZT20-23 26.2884 26.2884 26.2884