condition mean min max ZT0-3 858.830904 858.830904 858.830904 ZT4-7 517.871044 517.871044 517.871044 ZT8-11 527.5630385 527.5630385 527.5630385 ZT12-15 883.312946 883.312946 883.312946 ZT16-19 1267.304969 1267.304969 1267.304969 ZT20-23 1833.1784135 1833.1784135 1833.1784135