condition mean min max ZT0-3 10.309825 10.309825 10.309825 ZT4-7 8.517149999999999 8.517149999999999 8.517149999999999 ZT8-11 9.021715 9.021715 9.021715 ZT12-15 10.889050000000001 10.889050000000001 10.889050000000001 ZT16-19 15.192900000000002 15.192900000000002 15.192900000000002 ZT20-23 12.229800000000001 12.229800000000001 12.229800000000001