condition mean min max ZT0-3 0.69848732875 0.0 1.3969746575 ZT4-7 3.7099255165 2.2373717135 5.1824793195 ZT8-11 6.49131987975 6.0401355815 6.942504178 ZT12-15 10.471005424249999 8.6240372995 12.317973549 ZT16-19 9.931388923250001 9.6445115215 10.218266325 ZT20-23 8.96697859175 8.925118005 9.0088391785