condition mean min max ZT0-3 35.6485571575 33.80619377 37.490920545 ZT4-7 39.823891897500005 38.411122520000006 41.236661275 ZT8-11 30.4891053275 27.921192089999998 33.057018565 ZT12-15 12.43938249325 11.39605765 13.482707336499999 ZT16-19 16.711436409999997 15.869231504999998 17.553641315 ZT20-23 18.5534304 17.877026615 19.229834185