condition mean min max ZT0-3 27.620399999999997 23.90315 31.337649999999996 ZT4-7 12.97245 12.97245 12.97245 ZT8-11 13.06655 13.06655 13.06655 ZT12-15 0 0 0 ZT16-19 27.483449999999998 27.483449999999998 27.483449999999998 ZT20-23 25.0482 25.0482 25.0482