condition mean min max ZT0-3 22.702849999999998 22.702849999999998 22.702849999999998 ZT4-7 21.2956 21.2956 21.2956 ZT8-11 15.7405 15.7405 15.7405 ZT12-15 12.9519 12.9519 12.9519 ZT16-19 24.738799999999998 24.738799999999998 24.738799999999998 ZT20-23 23.18525 23.18525 23.18525