condition mean min max ZT0-3 4.74155 4.74155 4.74155 ZT4-7 0.7733895 0.7733895 0.7733895 ZT8-11 2.7538850000000004 2.7538850000000004 2.7538850000000004 ZT12-15 12.887350000000001 12.887350000000001 12.887350000000001 ZT16-19 13.94445 13.94445 13.94445 ZT20-23 13.03425 13.03425 13.03425