condition mean min max ZT0-3 3.92493 3.92493 3.92493 ZT4-7 2.859745 2.859745 2.859745 ZT8-11 2.00637 2.00637 2.00637 ZT12-15 2.357135 2.357135 2.357135 ZT16-19 2.298345 2.298345 2.298345 ZT20-23 4.946955 4.946955 4.946955