condition mean min max ZT0-3 81.331851 81.331851 81.331851 ZT4-7 55.0895785 55.0895785 55.0895785 ZT8-11 42.720577500000005 42.720577500000005 42.720577500000005 ZT12-15 46.7425755 46.7425755 46.7425755 ZT16-19 28.9350575 28.9350575 28.9350575 ZT20-23 38.957005 38.957005 38.957005