condition mean min max ZT0-3 78.99955363 55.01385557 102.98525168999998 ZT4-7 378.56228285 299.39646454999996 457.72810115000004 ZT8-11 720.221023975 665.0391778999999 775.40287005 ZT12-15 827.941161375 726.35693375 929.5253889999999 ZT16-19 493.625053625 443.40656655 543.8435407000001 ZT20-23 310.83774512499997 266.16935985 355.50613039999996