condition mean min max ZT0-3 6.34003546725 5.697818279 6.9822526555 ZT4-7 5.772628557499999 5.600949951 5.944307164 ZT8-11 9.095817011 7.361208491999999 10.83042553 ZT12-15 8.5723475765 7.7091297270000005 9.435565426 ZT16-19 8.244673504 7.593051786 8.896295222 ZT20-23 9.978982208249999 9.637287935 10.3206764815