condition mean min max ZT0-3 10.073072499999999 9.08686 11.059285 ZT4-7 35.293800000000005 35.293800000000005 35.293800000000005 ZT8-11 26.02715 26.02715 26.02715 ZT12-15 0 0 0 ZT16-19 10.517915 10.517915 10.517915 ZT20-23 5.54866 5.54866 5.54866