condition mean min max ZT0-3 10.473737499999999 8.181025 12.766449999999999 ZT4-7 11.06925 11.06925 11.06925 ZT8-11 9.11302 9.11302 9.11302 ZT12-15 0 0 0 ZT16-19 10.18472 10.18472 10.18472 ZT20-23 12.7915 12.7915 12.7915