condition mean min max ZT0-3 4.482703349 2.706505813 6.258900885 ZT4-7 8.93190669125 7.461502470999999 10.402310911499999 ZT8-11 8.08233084625 6.6675940570000005 9.4970676355 ZT12-15 8.07082299925 6.954386038499999 9.18725996 ZT16-19 12.74054099 11.33602454 14.14505744 ZT20-23 18.020398505000003 16.628487845000002 19.412309165