condition mean min max ZT0-3 2.0040199999999997 1.6767699999999999 2.2549599999999996 ZT4-7 4.6758299999999995 4.6758299999999995 4.6758299999999995 ZT8-11 3.353115 3.353115 3.353115 ZT12-15 3.2659925 2.705335 3.82665 ZT16-19 3.87078 3.87078 3.87078 ZT20-23 3.00514 3.00514 3.00514