condition mean min max ZT0-3 17.371025000000003 17.338900000000002 17.40315 ZT4-7 15.3904 15.3904 15.3904 ZT8-11 9.452580000000001 9.452580000000001 9.452580000000001 ZT12-15 0 0 0 ZT16-19 12.66575 12.66575 12.66575 ZT20-23 15.984100000000002 15.984100000000002 15.984100000000002