Table 5.

Cartilage T2 values (in ms) and mean gray level co-occurrence matrix (GLCM) parameters

Parameter	Subjects		P-value
	African American n = 100	Caucasian American n = 100
Laminar analysis
Mean Superficial Layer T2*	34.67 [34.27–35.06]	35.91 [35.46–36.35]	<0.001
LF Superficial Layer T2	35.62 [35.09–36.14]	36.94 [36.38–37.50]	<0.001
LT Superficial T2	31.08 [30.50–31.66]	32.35 [31.67–33.03]	0.003
MF Superficial T2	38.42 [37.89–38.94]	39.93 [39.32–40.54]	<0.001
MT Superficial T2	31.51 [30.96–32.05]	33.48 [32.90–34.07]	<0.001
PAT Superficial T2	36.71 [36.08–37.34]	36.82 [36.23–37.42]	0.776
Mean Deep Layer T2*	29.53 [29.23–29.82]	29.93 [29.61–30.26]	0.031
LF Deep Layer T2	31.51 [31.07–31.95]	32.16 [31.73–32.59]	0.019
LT Deep Layer T2	24.49 [24.13–24.85]	24.63 [24.20–25.07]	0.579
MF Deep Layer T2	35.54 [35.00–36.07]	36.22 [35.65–36.78]	0.038
MT Deep Layer T2	26.73 [26.41–27.06]	26.41 [26.04–26.78]	0.160
PAT Deep Layer T2	29.37 [28.90–29.85]	30.22 [29.72–30.73]	0.018
Texture analysis
Mean Contrast*	281.83 [271.31–292.35]	295.01 [283.40–306.84]	0.018
LF Contrast	265.62 [254.67–276.58]	274.60 [262.48–286.72]	0.202
LT Contrast	184.02 [174.75–193.28]	197.93 [185.18–210.69]	0.038
MF Contrast	372.66 [354.97–390.35]	405.57 [385.91–425.23]	<0.001
MT Contrast	291.95 [275.44–308.45]	296.02 [279.19–312.84]	0.703
PAT Contrast	294.90 [278.83–310.97]	300.95 [284.16–317.73]	0.536
Mean Entropy*	6.20 [6.17–6.23]	6.24 [6.20–6.28]	0.090
LF Entropy	6.59 [6.54–6.65]	6.65 [6.60–6.70]	0.119
LT Entropy	5.68 [5.63–5.74]	5.77 [5.71–5.83]	0.035
MF Entropy	6.83 [6.79–6.88]	6.88 [6.83–6.93]	0.113
MT Entropy	5.83 [5.79–5.88]	5.91 [5.87–5.96]	0.009
PAT Entropy	6.06 [6.00–6.12]	6.00 [5.93–6.06]	0.157

LF Lateral Femur; LT Lateral Tibia; MF Medial Tibia; MT Medial Tibia; PAT Patella

^*Global knee joint

P values < 0.05 are in bold.

Data are given as mean values [95% Confidence Intervals ]