condition mean min max ZT0-3 470.696551 470.696551 470.696551 ZT4-7 440.7177915 440.7177915 440.7177915 ZT8-11 232.991547 232.991547 232.991547 ZT12-15 261.9079655 261.9079655 261.9079655 ZT16-19 182.477818 182.477818 182.477818 ZT20-23 167.870251 167.870251 167.870251