condition mean min max ZT0-3 6.1507000000000005 6.1507000000000005 6.1507000000000005 ZT4-7 5.08915 5.08915 5.08915 ZT8-11 4.870025 4.870025 4.870025 ZT12-15 5.36902 5.36902 5.36902 ZT16-19 7.381475 7.381475 7.381475 ZT20-23 5.742900000000001 5.742900000000001 5.742900000000001