condition mean min max ZT0-3 2.8981325 2.48685 3.309415 ZT4-7 3.65721 3.65721 3.65721 ZT8-11 4.698255 4.698255 4.698255 ZT12-15 0 0 0 ZT16-19 5.802515 5.802515 5.802515 ZT20-23 4.427715 4.427715 4.427715