condition mean min max ZT0-3 0.22557055524999997 0.068709559 0.38243155149999997 ZT4-7 1.357196847 0.7953224569999999 1.9190712369999998 ZT8-11 9.60304314275 4.940024258 14.2660620275 ZT12-15 17.3427049725 16.281863305 18.40354664 ZT16-19 9.110620152749998 8.7829016675 9.438338638 ZT20-23 6.58459434775 6.2103952510000004 6.9587934445