condition mean min max ZT0-3 17.7234 15.90885 19.537950000000002 ZT4-7 26.243 26.243 26.243 ZT8-11 26.85455 26.85455 26.85455 ZT12-15 0 0 0 ZT16-19 33.715199999999996 33.715199999999996 33.715199999999996 ZT20-23 22.3893 22.3893 22.3893