condition mean min max ZT0-3 473.65 473.65 473.65 ZT4-7 518.9 518.9 518.9 ZT8-11 501.95000000000005 501.95000000000005 501.95000000000005 ZT12-15 590.0999999999999 590.0999999999999 590.0999999999999 ZT16-19 659.95 659.95 659.95 ZT20-23 626.75 626.75 626.75