condition mean min max ZT0-3 11.578976 11.578976 11.578976 ZT4-7 12.1232595 12.1232595 12.1232595 ZT8-11 10.441127 10.441127 10.441127 ZT12-15 10.37664 10.37664 10.37664 ZT16-19 10.3655985 10.3655985 10.3655985 ZT20-23 9.9613425 9.9613425 9.9613425