condition mean min max ZT0-3 13.482953 13.482953 13.482953 ZT4-7 13.6264055 13.6264055 13.6264055 ZT8-11 12.661381 12.661381 12.661381 ZT12-15 10.998251 10.998251 10.998251 ZT16-19 9.822744499999999 9.822744499999999 9.822744499999999 ZT20-23 11.6798185 11.6798185 11.6798185