condition mean min max ZT0-3 674.1877777666666 674.1877777666666 674.1877777666666 ZT4-7 823.8988889 823.8988889 823.8988889 ZT8-11 945.1777778000001 945.1777778000001 945.1777778000001 ZT12-15 795.3611111 795.3611111 795.3611111 ZT16-19 542.6955555666667 542.6955555666667 542.6955555666667 ZT20-23 534.5722221999999 534.5722221999999 534.5722221999999