condition mean min max ZT0-3 12.165440803500001 10.521188707 13.8096929 ZT4-7 9.489053135 7.62356617 11.354540100000001 ZT8-11 11.731596184999999 10.59140862 12.871783749999999 ZT12-15 5.2849361205 3.8886834419999996 6.681188799000001 ZT16-19 3.5064632700000002 3.330401201 3.682525339 ZT20-23 3.8437371235 3.5946379175 4.0928363295