condition mean min max ZT0-3 2780.986435 2780.986435 2780.986435 ZT4-7 3796.6177855 3796.6177855 3796.6177855 ZT8-11 3105.5746105 3105.5746105 3105.5746105 ZT12-15 3161.0594810000002 3161.0594810000002 3161.0594810000002 ZT16-19 2755.7001665 2755.7001665 2755.7001665 ZT20-23 2473.1216675 2473.1216675 2473.1216675