condition mean min max ZT0-3 3.52038025 2.4895078039999996 4.551252696000001 ZT4-7 3.46821438325 2.821395235 4.1150335315 ZT8-11 5.336442733249999 4.528535163 6.1443503034999996 ZT12-15 5.73731697475 5.289938007 6.184695942499999 ZT16-19 3.9315331195 3.5992079090000004 4.26385833 ZT20-23 5.093492868 4.627737676500001 5.5592480595