condition mean min max ZT0-3 0.4518566666666667 0.335483 0.621665 ZT4-7 0.49175199999999997 0.49175199999999997 0.49175199999999997 ZT8-11 0.4110735 0.4110735 0.4110735 ZT12-15 1.4768725 1.24145 1.7122950000000001 ZT16-19 1.55709 1.55709 1.55709 ZT20-23 1.652545 1.652545 1.652545