|  | Amino acid | |||||
---|---|---|---|---|---|---|---|
 |  | Asx | Ser | Leu | Ile | Glx | Ala |
Normal articular cartilage | Mean (nmol/mg) | 157.3 | 104.8 | 87.4 | 37.2 | 252.5 | 262 |
 | r 2 | 0.054 | 0.037 | 0.042 | 0.065 | 0.060 | 0.090 |
 | Slope | -0.456 | -0.233 | -0.203 | -0.120 | -0.796 | -1.040 |
 | P value | 0.327 | 0.418 | 0.399 | 0.293 | 0.297 | 0.198 |
OA articular cartilage | Mean (nmol/mg) | 99.5 | 67.7 | 56.0 | 23.2 | 159.1 | 165.7 |
 | r 2 | 0.076 | 0.070 | 0.028 | 0.081 | 0.056 | 0.059 |
 | Slope | 0.419 | 0.278 | 0.237 | 0.196 | 0.532 | 0.645 |
 | P value | 0.141 | 0.157 | 0.377 | 0.129 | 0.208 | 0.196 |
OA meniscal cartilage | Mean (nmol/mg) | 100.4 | 74.6 | 53.4 | 23.7 | 140.5 | 180.4 |
 | r 2 | 0.208 | 0.194 | 0.143 | 0.144 | 0.194 | 0.232 |
 | Slope | -1.11 | -0.78 | -1.06 | -0.458 | -1.59 | -2.57 |
 | P value | 0.011a | 0.015a | 0.040a | 0.039a | 0.015a | 0.007a |