condition mean min max ZT0-3 394.214908 394.214908 394.214908 ZT4-7 472.7381905 472.7381905 472.7381905 ZT8-11 504.5280845 504.5280845 504.5280845 ZT12-15 460.7412685 460.7412685 460.7412685 ZT16-19 562.565242 562.565242 562.565242 ZT20-23 666.981724 666.981724 666.981724