condition mean min max ZT0-3 39.800812147500004 38.469367095 41.132257200000005 ZT4-7 22.5844959525 20.727717525000003 24.44127438 ZT8-11 36.28449732 28.65550442 43.91349022 ZT12-15 28.3933538175 19.95737047 36.829337165 ZT16-19 23.19522479 21.685680845 24.704768735000002 ZT20-23 32.95537693 30.83531773 35.07543613