condition mean min max ZT0-3 61.3089573175 53.011637424999996 69.60627721 ZT4-7 41.985637775 40.252905825 43.718369725 ZT8-11 33.319916595 33.174825415 33.465007775000004 ZT12-15 21.2633778175 17.1275641 25.399191535 ZT16-19 26.514433984999997 21.70682647 31.322041499999997 ZT20-23 38.430581285 35.568461215 41.292701355000005