condition mean min max ZT0-3 9.214007 9.214007 9.214007 ZT4-7 8.6917165 8.6917165 8.6917165 ZT8-11 9.3949105 9.3949105 9.3949105 ZT12-15 8.9429955 8.9429955 8.9429955 ZT16-19 9.0089015 9.0089015 9.0089015 ZT20-23 9.8748225 9.8748225 9.8748225