condition mean min max ZT0-3 0.03091023775 0.0 0.0618204755 ZT4-7 1.91459545025 0.63683531 3.1923555905 ZT8-11 5.90900249025 5.190330461 6.627674519499999 ZT12-15 9.1993381065 9.16804686 9.230629353 ZT16-19 8.325129706 8.295336970000001 8.354922442 ZT20-23 8.068447543000001 7.296792845000001 8.840102241