Accuracy in cv::mean function between opencv 2.4.9 and opencv 3.1.0

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Hello,

I just changed my software which was using opencv 2.4.9 version to opencv 3.1.0 and I am having a very very little differences from cv::mean function.

cv::Scalar aux1 = cv::mean(img_32);
std::cout << "MEAN: "<< aux1.val[0] << std::endl;

Output with opencv 2.4.9:

From ORIGINAL [img_32]:  [169,168,208] // Some pixel values from img_32
MEAN: 0.439712

Output with opencv 3.1.0:

From UPDATED [img_32]:  [169,168,208] // Some pixel values from img_32
MEAN: 0.439713

I checked rigorously if there were differences in the image.... Can anyone help me?? Any idea??

Thanks in advance