condition mean min max ZT0-3 6.169877271500001 5.606935331 6.732819212000001 ZT4-7 6.9607879189999995 5.9488268965 7.9727489415 ZT8-11 10.8927381245 9.966682009 11.818794239999999 ZT12-15 8.46047931125 6.519875689499999 10.401082933 ZT16-19 10.9301249 10.171210325 11.689039475 ZT20-23 9.158805245749999 7.7915393250000005 10.5260711665