Table 3. Multivariate Analysis of the Predictors of OT Referral by Fitting Multiple Logistic Regression Model: IADL and BADL Models.
| IADL Model | BADL Model | |||||
|---|---|---|---|---|---|---|
| OR | P-value | 95% CI | OR | P-value | 95% CI | |
| Lawton Scale | 0.41 | < 0.001 | 0.28–0.60 | - | - | - |
| Barthel Index | - | - | - | 0.77 | < 0.01 | 0.64–0.94 |
| Dementia | 61.49 | < 0.05 | 2.31–1636.29 | 48.26 | < 0.05 | 2.09–1114.66 |
| SPMSQ (2–9) | 14.60 | < 0.01 | 2.93–72.79 | 8.87 | < 0.01 | 2.10–37.50 |
| ROM Limitation | 13.76 | < 0.01 | 2.01–94.24 | 13.97 | < 0.01 | 2.08–93.87 |
| Psychiatric Disorders | 11.04 | < 0.01 | 2.17–56.09 | 13.95 | < 0.001 | 3.12–62.34 |
| ≥ 2 (for ADL model) or ≥ 3 (for IADL model) Behavioral and Emotional Measures | 9.87 | < 0.01 | 1.79–54.35 | 5.78 | < 0.05 | 1.25–26.81 |
| Fear of Falling | 11.45 | < 0.01 | 2.15–61.11 | 13. 93 | < 0.01 | 2.71–71.75 |
| Unable to Express Oneself | - | - | - | 6.85 | < 0.05 | 1.23–38.04 |
OT: occupational therapy; IADL: instrumental activities of daily living; BADL: basic activities of daily living; OR: odds ratio; CI: confidence interval; SPMSQ: Short Portable Mental Status Questionnaire, range: 0–10; ROM: range of motion. IADL Model: Sample size (n) = 221 and the number of estimated parameters (p) = 8. Goodness-of-fit assessment: n = 221, adjusted generalized R2 = 0.800 > 0.3, the estimated area under the Receiver Operating Characteristic (ROC) curve = 0.977 > 0.7 (se = 0.008), the modified Hosmer-Lemeshow goodness-of-fit F test p = 0.5001 > 0.05 (df = 9, 211), and the ratio of residual deviance and its degrees of freedom, 71.5356/213 = 0.3358 ≤ 1.0, which indicated an excellent fit. BADL Model: Sample size (n) = 221 and the number of estimated parameters (p) = 9. Goodness-of-fit assessment: n = 221, adjusted generalized R2 = 0.778 > 0.3, the estimated area under the Receiver Operating Characteristic (ROC) curve = 0.972 > 0.7 (se = 0.009), the modified Hosmer-Lemeshow goodness-of-fit F test p = 0.6234 > 0.05 (df = 9, 211), and the ratio of residual deviance and its degrees of freedom, 78.1694/212 = 0.3687 ≤ 1.0, which indicated an excellent fit. In both logistic regression models, n–p ≥ 200, which indicated that our sample size was not too small.