condition mean min max ZT0-3 52.264925 44.254549999999995 60.2753 ZT4-7 21.13355 21.13355 21.13355 ZT8-11 19.401049999999998 19.401049999999998 19.401049999999998 ZT12-15 0 0 0 ZT16-19 51.6676 51.6676 51.6676 ZT20-23 40.7159 40.7159 40.7159