condition mean min max ZT0-3 23.945221002500002 8.77563738 39.114804625000005 ZT4-7 146.197435415 121.32022173 171.0746491 ZT8-11 100.16758789 84.475513155 115.859662625 ZT12-15 54.006794605 50.12872559 57.884863620000004 ZT16-19 60.9867028675 59.410036340000005 62.563369394999995 ZT20-23 53.27809645000001 46.16196688 60.394226020000005