condition mean min max ZT0-3 17931.09441 17931.09441 17931.09441 ZT4-7 17454.186485 17454.186485 17454.186485 ZT8-11 17356.440635 17356.440635 17356.440635 ZT12-15 17619.0584 17619.0584 17619.0584 ZT16-19 18696.30449 18696.30449 18696.30449 ZT20-23 17911.10907 17911.10907 17911.10907