condition mean min max ZT0-3 170.97699999999998 170.97699999999998 170.97699999999998 ZT4-7 223.24599999999998 223.24599999999998 223.24599999999998 ZT8-11 138.936 138.936 138.936 ZT12-15 74.78479999999999 74.78479999999999 74.78479999999999 ZT16-19 63.59735 63.59735 63.59735 ZT20-23 111.9885 111.9885 111.9885