condition mean min max ZT0-3 67.31587240500001 61.1697744 73.46197041 ZT4-7 35.109504205 30.09984491 40.1191635 ZT8-11 27.1994002675 23.779730995 30.619069539999998 ZT12-15 11.079430275 4.3277366265 17.8311239235 ZT16-19 7.00431674575 5.898601606 8.1100318855 ZT20-23 6.740359989250001 5.011548086 8.4691718925