condition mean min max ZT0-3 5.591522175250001 4.2722243415 6.910820009 ZT4-7 6.46842912675 4.6142229515 8.322635302 ZT8-11 10.460322978250002 9.382675626500001 11.53797033 ZT12-15 8.88326163125 8.8438846375 8.922638625000001 ZT16-19 3.9495863882499997 3.8773975270000003 4.021775249499999 ZT20-23 4.853963965999999 4.410316616499999 5.297611315499999