condition mean min max ZT0-3 4.9914000000000005 3.997675 5.985125 ZT4-7 3.76124 3.76124 3.76124 ZT8-11 3.440845 3.440845 3.440845 ZT12-15 0 0 0 ZT16-19 3.4590699999999996 3.4590699999999996 3.4590699999999996 ZT20-23 3.001435 3.001435 3.001435