condition mean min max ZT0-3 218.039659 218.039659 218.039659 ZT4-7 191.61777999999998 191.61777999999998 191.61777999999998 ZT8-11 150.5139155 150.5139155 150.5139155 ZT12-15 144.9862475 144.9862475 144.9862475 ZT16-19 84.08741549999999 84.08741549999999 84.08741549999999 ZT20-23 76.895078 76.895078 76.895078