Table 5.
Beta coefficients and cumulative R2 values derived from stepwise multiple regression models
| Variables | LBP disability status (OSW score, 0–100)
|
|||||
|---|---|---|---|---|---|---|
| Minimal (0%–20%)
|
Moderate (21%–40%)
|
Severe (41%–60%)
|
||||
| R2 (β)* | 95% CI | R2 (β)** | 95% CI | R2 (β)** | 95% CI | |
| Age | 9.5 (0.58) | 75 (65–87) | 8.1 (0.38) | 91 (65–98) | 6.5 (0.47) | 87 (65–100) |
| Gender | 4.1 (0.25) | 95 (65–100) | 3.4 (0.34) | 96 (71–100) | 3.8 (0.54) | 86 (75–100) |
| Body weight (kg) | 15.4 (0.48) | 85 (75–100) | 11.4 (0.21) | 84 (75–98) | 10.4 (0.28) | 81 (75–98) |
| BMI (kg/m2) | 8.9 (0.35) | 95 (56–100) | 5.3 (0.25) | 89 (74–100) | 5.1 (0.46) | 91 (74–98) |
| Vitamin 25(OH)D status (ng/mL) | 26.4 (0.31) | 72 (65–96) | 16.5 (0.56) | 86 (68–96) | 11.5 (0.49) | 78 (68–98) |
| CK (IU/L) | 1.8 (0.13) | 78 (65–100) | 3.1 (0.24) | 76 (65–100) | 4.7 (0.34) | 69 (65–96) |
| LDH (IU/L) | 3.1 (0.31) | 87 (69–98) | 2.6 (0.42) | 90 (69–98) | 4.5 (0.47) | 95 (69–100) |
| Ca (mg/dL) | 8.6 (0.47) | 59 (42–89) | 5.6 (0.37) | 68 (56–95) | 4.6 (0.48) | 85 (76–98) |
| sBAP (IU/L) | 3.5 (0.28) | 81 (65–96) | 1.9 (0.34) | 92 (78–98) | 2.3 (0.54) | 91 (78–98) |
| PA (min/week) | 5.7 (0.29) | 59 (41–86) | 3.7 (039) | 95 (86–100) | 3.4 (0.28) | 89 (86–100) |
| ΣR2 (%) | 86.7 (0.34) | 98 (75–100) | 61.5 (0.35) | 91 (85–100) | 56.8 (0.34) | 95 (85–100) |
Note:
*
P<0.05;
**
P<0.01. ΣR2 = summation of cumulative values of R relating to studied variables.
Abbreviations: LBP, low back pain; OSW, Oswestry Low Back Pain Disability Questionnaire; CI, confidence interval; BMI, body mass index; CK, creatine kinase; LDH, lactate dehydrogenase; Ca, calcium; sBAP, serum bone-specific alkaline phosphatase; PA, physical activity.