condition mean min max ZT0-3 135.1646166666667 104.28585 152.9875 ZT4-7 67.03784999999999 67.03784999999999 67.03784999999999 ZT8-11 7.42802 7.42802 7.42802 ZT12-15 9.310765 4.88263 13.738900000000001 ZT16-19 6.81216 6.81216 6.81216 ZT20-23 40.4281 40.4281 40.4281