Table 2. Correlations between logarithmic serum ucOC and OC concentrations and each parameter in univariate models.
| ucOC (ng/ml) | OC (ng/ml) | Log ucOC (ng/ml) | Log OC (ng/ml) | |||||
|---|---|---|---|---|---|---|---|---|
| r | P | r | P | r | P | r | P | |
| Age (years) | -0.157 | 0.184 | -0.178 | 0.132 | -0.186 | 0.114 | -0.193 | 0.102 |
| Duration of diabetes (years) | -0.174 | 0.140 | -0.176 | 0.137 | -0.138 | 0.243 | -0.143 | 0.229 |
| BMI (kg/m2) | -0.184 | 0.120 | -0.176 | 0.137 | -0.204 | 0.084 | -0.185 | 0.117 |
| TDD (units) | -0.032 | 0.788 | -0.030 | 0.798 | 0.012 | 0.918 | -0.009 | 0.942 |
| TDD/kg (units/kg) | 0.061 | 0.607 | 0.057 | 0.635 | 0.089 | 0.456 | 0.061 | 0.611 |
| Basal (units) | -0.040 | 0.738 | -0.030 | 0.803 | 0.011 | 0.923 | -0.002 | 0.984 |
| Basal/kg (units/kg) | 0.040 | 0.737 | 0.053 | 0.658 | 0.065 | 0.584 | 0.061 | 0.608 |
| Bolus (units) | -0.021 | 0.860 | -0.024 | 0.838 | 0.010 | 0.933 | -0.010 | 0.931 |
| Bolus/kg (units/kg) | 0.049 | 0.680 | 0.036 | 0.762 | 0.067 | 0.575 | 0.036 | 0.764 |
| HbA1c (%) | -0.086 | 0.473 | -0.116 | 0.334 | -0.057 | 0.635 | -0.127 | 0.288 |
| eGFR (ml/min/1.73 m2) | -0.203 | 0.086 | -0.231 | 0.050 | -0.103 | 0.387 | -0.168 | 0.155 |
| Albuminuria (mg/gCr) | 0.074 | 0.535 | 0.102 | 0.389 | 0.028 | 0.816 | 0.085 | 0.475 |
| %Body fat (%) | -0.261 | 0.028* | -0.278 | 0.019* | -0.319 | 0.007* | -0.321 | 0.006* |
| Adiponectin (μg/ml) | -0.078 | 0.511 | -0.060 | 0.617 | -0.140 | 0.237 | -0.070 | 0.554 |
| Free-testosterone (pg/ml) (in males) |
0.081 | 0.719 | 0.104 | 0.644 | 0.074 | 0.743 | 0.079 | 0.726 |
| SMI (kg/m2) | -0.060 | 0.622 | -0.043 | 0.719 | -0.061 | 0.613 | -0.017 | 0.885 |
| Grip strength (kg) | 0.017 | 0.887 | 0.030 | 0.800 | 0.146 | 0.222 | 0.124 | 0.298 |
| Knee extension strength (kg) | 0.014 | 0.908 | 0.055 | 0.642 | 0.103 | 0.386 | 0.116 | 0.330 |
| Gait speed (m/s) | -0.055 | 0.649 | 0.005 | 0.969 | 0.009 | 0.943 | 0.084 | 0.483 |
* Statistically significant (P < 0.05).
ucOC, undercarboxylated osteocalcin; OC, osteocalcin; BMI, body mass index; MDI, multiple daily injection of insulin; CSII, continuous subcutaneous insulin infusion; TDD, total daily dose of insulin; TDD/kg, body weight-adjusted total daily dose of insulin; Basal, basal dose of insulin; Basal/kg, body weight-adjusted basal dose of insulin; Bolus, bolus dose of insulin; Bolus/kg, body weight-adjusted bolus dose of insulin; HbA1c, glycated hemoglobin; eGFR, estimated glomerular filtration rate; SMI, skeletal muscle mass index.