condition mean min max ZT0-3 319.292341 319.292341 319.292341 ZT4-7 146.2645145 146.2645145 146.2645145 ZT8-11 262.27826 262.27826 262.27826 ZT12-15 363.1784225 363.1784225 363.1784225 ZT16-19 273.06268850000004 273.06268850000004 273.06268850000004 ZT20-23 291.00079900000003 291.00079900000003 291.00079900000003