condition mean min max ZT0-3 3.390855 2.97175 3.8099600000000002 ZT4-7 3.3100449999999997 3.3100449999999997 3.3100449999999997 ZT8-11 1.720235 1.720235 1.720235 ZT12-15 0 0 0 ZT16-19 2.74067 2.74067 2.74067 ZT20-23 3.4819500000000003 3.4819500000000003 3.4819500000000003