condition mean min max ZT0-3 69.297146 69.297146 69.297146 ZT4-7 119.6620675 119.6620675 119.6620675 ZT8-11 161.9443935 161.9443935 161.9443935 ZT12-15 124.317059 124.317059 124.317059 ZT16-19 89.09222199999999 89.09222199999999 89.09222199999999 ZT20-23 85.798271 85.798271 85.798271