condition mean min max ZT0-3 240.62222219999998 240.62222219999998 240.62222219999998 ZT4-7 136.31611113333332 136.31611113333332 136.31611113333332 ZT8-11 96.57222221 96.57222221 96.57222221 ZT12-15 108.45000001 108.45000001 108.45000001 ZT16-19 143.23444443333335 143.23444443333335 143.23444443333335 ZT20-23 167.27 167.27 167.27