condition mean min max ZT0-3 44.356049999999996 37.7495 49.81505 ZT4-7 28.797800000000002 28.797800000000002 28.797800000000002 ZT8-11 23.5581 23.5581 23.5581 ZT12-15 29.032175 27.9122 30.15215 ZT16-19 33.8133 33.8133 33.8133 ZT20-23 41.6911 41.6911 41.6911