condition mean min max ZT0-3 28.627299999999998 28.627299999999998 28.627299999999998 ZT4-7 26.874299999999998 26.874299999999998 26.874299999999998 ZT8-11 19.0308 19.0308 19.0308 ZT12-15 23.6085 23.6085 23.6085 ZT16-19 22.0911 22.0911 22.0911 ZT20-23 28.49445 28.49445 28.49445