condition mean min max ZT0-3 6.838464999999999 6.838464999999999 6.838464999999999 ZT4-7 4.327615 4.327615 4.327615 ZT8-11 4.78749 4.78749 4.78749 ZT12-15 7.34558 7.34558 7.34558 ZT16-19 10.22756 10.22756 10.22756 ZT20-23 8.04807 8.04807 8.04807