condition mean min max ZT0-3 0.1901799555 0.0 0.380359911 ZT4-7 1.2270066325 0.674442256 1.779571009 ZT8-11 1.6831945962500001 1.4015963115 1.9647928810000002 ZT12-15 1.7469096895 1.6270175665000002 1.8668018124999999 ZT16-19 1.94914506875 1.5156700585 2.382620079 ZT20-23 2.56832297175 2.1374518929999997 2.9991940505