condition mean min max ZT0-3 9.017145 8.33579 9.6985 ZT4-7 24.54135 24.54135 24.54135 ZT8-11 24.764650000000003 24.764650000000003 24.764650000000003 ZT12-15 0 0 0 ZT16-19 9.17351 9.17351 9.17351 ZT20-23 17.12715 17.12715 17.12715