condition mean min max ZT0-3 9.837715000000001 4.556295 12.73925 ZT4-7 4.5605899999999995 4.5605899999999995 4.5605899999999995 ZT8-11 4.861174999999999 4.861174999999999 4.861174999999999 ZT12-15 8.0858325 7.66379 8.507875 ZT16-19 9.014955 9.014955 9.014955 ZT20-23 10.386700000000001 10.386700000000001 10.386700000000001