condition mean min max ZT0-3 27.3485777075 23.539731565 31.15742385 ZT4-7 12.1738576375 11.515233904999999 12.83248137 ZT8-11 12.382462502500001 11.56888724 13.196037765 ZT12-15 7.82817710575 7.054128662 8.6022255495 ZT16-19 8.8745712825 7.6588965245 10.0902460405 ZT20-23 16.8934188925 14.480420500000001 19.306417285000002