condition mean min max ZT0-3 12.785116666666667 10.77325 15.397649999999999 ZT4-7 11.6985 11.6985 11.6985 ZT8-11 14.11115 14.11115 14.11115 ZT12-15 23.680425 21.1752 26.18565 ZT16-19 24.855800000000002 24.855800000000002 24.855800000000002 ZT20-23 23.67745 23.67745 23.67745