condition mean min max ZT0-3 10.997945 2.754385 15.9453 ZT4-7 0.610411 0.610411 0.610411 ZT8-11 0.181032 0.181032 0.181032 ZT12-15 0.41046350000000004 0.27060850000000003 0.5503185 ZT16-19 0.30497755 0.30497755 0.30497755 ZT20-23 2.957915 2.957915 2.957915