condition mean min max ZT0-3 29.365949999999998 26.38015 32.351749999999996 ZT4-7 30.424550000000004 30.424550000000004 30.424550000000004 ZT8-11 14.747499999999999 14.747499999999999 14.747499999999999 ZT12-15 0 0 0 ZT16-19 33.5471 33.5471 33.5471 ZT20-23 42.313599999999994 42.313599999999994 42.313599999999994