condition mean min max ZT0-3 47.04841666666667 35.9458 53.0424 ZT4-7 30.5794 30.5794 30.5794 ZT8-11 44.9701 44.9701 44.9701 ZT12-15 47.671375 44.03165 51.311099999999996 ZT16-19 43.870400000000004 43.870400000000004 43.870400000000004 ZT20-23 50.18325 50.18325 50.18325