condition mean min max ZT0-3 34.2296 22.32465 40.583800000000004 ZT4-7 19.769750000000002 19.769750000000002 19.769750000000002 ZT8-11 38.4834 38.4834 38.4834 ZT12-15 37.04985 36.32615 37.77355 ZT16-19 40.412499999999994 40.412499999999994 40.412499999999994 ZT20-23 48.084500000000006 48.084500000000006 48.084500000000006