condition mean min max ZT0-3 22.56595 22.56595 22.56595 ZT4-7 17.1506 17.1506 17.1506 ZT8-11 22.8445 22.8445 22.8445 ZT12-15 24.01125 24.01125 24.01125 ZT16-19 26.3704 26.3704 26.3704 ZT20-23 26.6862 26.6862 26.6862