condition mean min max ZT0-3 769.727685 769.727685 769.727685 ZT4-7 492.647824 492.647824 492.647824 ZT8-11 492.56472700000006 492.56472700000006 492.56472700000006 ZT12-15 662.6352744999999 662.6352744999999 662.6352744999999 ZT16-19 935.090755 935.090755 935.090755 ZT20-23 1139.6179339999999 1139.6179339999999 1139.6179339999999