condition mean min max ZT0-3 0.548659 0.548659 0.548659 ZT4-7 0.516644 0.516644 0.516644 ZT8-11 0.3750655 0.3750655 0.3750655 ZT12-15 0.297491 0.297491 0.297491 ZT16-19 0.511292 0.511292 0.511292 ZT20-23 0.40935200000000005 0.40935200000000005 0.40935200000000005