condition mean min max ZT0-3 25.1482539725 24.430221795 25.86628615 ZT4-7 28.470295450000002 25.083126595 31.857464305 ZT8-11 55.0967061975 41.683824015 68.50958838 ZT12-15 46.082128105 34.05914362 58.105112590000005 ZT16-19 19.51934718 17.687875005000002 21.350819355 ZT20-23 15.909958775 15.53680919 16.28310836