condition mean min max ZT0-3 10.916668 10.916668 10.916668 ZT4-7 10.8705005 10.8705005 10.8705005 ZT8-11 10.872435500000002 10.872435500000002 10.872435500000002 ZT12-15 10.9643875 10.9643875 10.9643875 ZT16-19 11.885807 11.885807 11.885807 ZT20-23 11.054528000000001 11.054528000000001 11.054528000000001