condition mean min max ZT0-3 62.2721338125 54.022747445 70.52152018 ZT4-7 28.458099767500002 26.711711085 30.20448845 ZT8-11 37.3789647125 29.84098245 44.916946975 ZT12-15 44.37957193 41.961244695000005 46.797899165 ZT16-19 42.8084292775 41.71292312 43.903935435 ZT20-23 43.7827864275 43.164777995 44.400794860000005