condition mean min max ZT0-3 20.022994022749998 14.043631105500001 26.00235694 ZT4-7 6.196650046749999 5.9755985835 6.41770151 ZT8-11 7.78241531775 6.849457099 8.7153735365 ZT12-15 12.38814809375 10.7702937825 14.006002405 ZT16-19 24.9413158475 20.257985795 29.624645899999997 ZT20-23 41.051609305 37.110884315 44.992334295