condition mean min max ZT0-3 26.629355 13.951515 35.1429 ZT4-7 13.367049999999999 13.367049999999999 13.367049999999999 ZT8-11 16.6086 16.6086 16.6086 ZT12-15 47.832449999999994 37.12365 58.54125 ZT16-19 63.1772 63.1772 63.1772 ZT20-23 68.19095 68.19095 68.19095