condition mean min max ZT0-3 373.104954 373.104954 373.104954 ZT4-7 576.044922 576.044922 576.044922 ZT8-11 609.678192 609.678192 609.678192 ZT12-15 386.40928399999996 386.40928399999996 386.40928399999996 ZT16-19 347.3945855 347.3945855 347.3945855 ZT20-23 313.9985555 313.9985555 313.9985555