condition mean min max ZT0-3 2.64623 2.48119 2.81127 ZT4-7 4.097065 4.097065 4.097065 ZT8-11 3.00381 3.00381 3.00381 ZT12-15 0 0 0 ZT16-19 4.19193 4.19193 4.19193 ZT20-23 2.875425 2.875425 2.875425