condition mean min max ZT0-3 186.547586 186.547586 186.547586 ZT4-7 166.1695955 166.1695955 166.1695955 ZT8-11 195.73429549999997 195.73429549999997 195.73429549999997 ZT12-15 278.664126 278.664126 278.664126 ZT16-19 209.595797 209.595797 209.595797 ZT20-23 184.9514945 184.9514945 184.9514945