condition mean min max ZT0-3 0.45439707900000004 0.43754603000000003 0.471248128 ZT4-7 1.839169049 1.399952607 2.278385491 ZT8-11 3.44501653775 2.4999687545000002 4.390064321 ZT12-15 5.500950165 5.2080170485 5.793883281499999 ZT16-19 3.68185716375 3.4406549055 3.9230594219999997 ZT20-23 3.66457466 3.5141970065 3.8149523135