condition mean min max ZT0-3 1.7847372747499999 1.1361933435 2.4332812059999998 ZT4-7 1.917389166 1.0557709245 2.7790074075 ZT8-11 21.5030169245 7.5300532085 35.4759806405 ZT12-15 62.6841377675 54.844021645 70.52425389 ZT16-19 32.25778232 25.04542768 39.47013696 ZT20-23 7.408685924 4.5144732880000005 10.30289856