condition mean min max ZT0-3 439.906668 439.906668 439.906668 ZT4-7 535.643344 535.643344 535.643344 ZT8-11 620.3639445 620.3639445 620.3639445 ZT12-15 695.0803615 695.0803615 695.0803615 ZT16-19 582.5761345 582.5761345 582.5761345 ZT20-23 644.349109 644.349109 644.349109