condition mean min max ZT0-3 0.7228463333333334 0.553391 0.8107725000000001 ZT4-7 1.0616400000000001 1.0616400000000001 1.0616400000000001 ZT8-11 2.017935 2.017935 2.017935 ZT12-15 5.1193325 5.054525 5.184139999999999 ZT16-19 2.10631 2.10631 2.10631 ZT20-23 1.778585 1.778585 1.778585