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Table 2 Polychoric correlations between the seven mammography qualityindicators

From: Mammogram image quality as a potential contributor to disparities in breastcancer stage at diagnosis: an observational study

Β 

Technologist-associated

Machine-associated

Β 

Positioning

Compression

Sharpness

Contrast

Noise

Exposure

Artifacts

Technologist-associated

Β Β Β Β Β Β 

Positioning

1

Β Β Β Β Β Β 

Compression

0.84

1

Β Β Β Β Β 

Sharpness

0.79

0.94

1

Β Β Β Β 

Machine-associated

Β Β Β Β Β Β 

Contrast

0.54

0.64

0.64

1

Β Β Β 

Noise

0.58

0.67

0.72

0.86

1

Β Β 

Exposure

0.51

0.62

0.69

0.93

0.85

1

Β 

Artifacts

0.60

0.63

0.71

0.77

0.85

0.80

1