condition mean min max ZT0-3 1.6854250000000002 1.14717 2.293775 ZT4-7 0.6970255 0.6970255 0.6970255 ZT8-11 1.27089 1.27089 1.27089 ZT12-15 1.32684675 0.5758535 2.07784 ZT16-19 1.6266699999999998 1.6266699999999998 1.6266699999999998 ZT20-23 2.5699045000000003 2.5699045000000003 2.5699045000000003