condition mean min max ZT0-3 5.9800225 5.39162 6.5684249999999995 ZT4-7 4.34573 4.34573 4.34573 ZT8-11 4.088265 4.088265 4.088265 ZT12-15 0 0 0 ZT16-19 6.441565 6.441565 6.441565 ZT20-23 5.279495000000001 5.279495000000001 5.279495000000001