condition mean min max ZT0-3 590.9 590.9 590.9 ZT4-7 558.8 558.8 558.8 ZT8-11 504.45000000000005 504.45000000000005 504.45000000000005 ZT12-15 501.6 501.6 501.6 ZT16-19 547.0999999999999 547.0999999999999 547.0999999999999 ZT20-23 573.55 573.55 573.55