condition mean min max ZT0-3 454.7505 454.7505 454.7505 ZT4-7 506.13149999999996 506.13149999999996 506.13149999999996 ZT8-11 385.49800000000005 385.49800000000005 385.49800000000005 ZT12-15 279.499 279.499 279.499 ZT16-19 308.83299999999997 308.83299999999997 308.83299999999997 ZT20-23 321.4285 321.4285 321.4285