condition mean min max ZT0-3 3.8921900000000003 3.1633 4.62108 ZT4-7 12.152275 12.152275 12.152275 ZT8-11 1.33544 1.33544 1.33544 ZT12-15 0 0 0 ZT16-19 0.556944 0.556944 0.556944 ZT20-23 3.85051 3.85051 3.85051