condition mean min max ZT0-3 2.0818661499999997 1.4349859530000002 2.7287463469999995 ZT4-7 8.58957939525 5.343434198 11.8357245925 ZT8-11 33.2740619125 22.52956885 44.018554975 ZT12-15 25.7971621625 19.27007933 32.324244995 ZT16-19 25.306432479999998 23.13699408 27.47587088 ZT20-23 16.22426586675 10.0959415285 22.352590205