Logistic regression model for SCI with reduced set of covariates, grouped into tertiles
| Covariate . | Odds ratio . | 95.0% CI for odds ratio . | P . | |
|---|---|---|---|---|
| Lower . | Upper . | |||
| Hemoglobin < 7.6 g/dL | 2.12 | 1.45 | 3.10 | < .001 |
| Hemoglobin ≥ 7.6 g/dL and ≤ 8.5 g/dL | 1.19 | 0.81 | 1.76 | .371 |
| Hemoglobin ≥ 8.6 g/dL (reference) | 1.00 | NA | NA | NA |
| SBP < 104 mmHg (reference) | 1.00 | NA | NA | NA |
| SBP ≥ 104 and ≤ 112 mmHg | 1.55 | 1.06 | 2.27 | .025 |
| SBP ≥ 113 mmHg | 1.73 | 1.18 | 2.54 | .005 |
| Sex (female, reference) | 1.42 | 1.04 | 1.93 | .026 |
| Constant | 0.26 | NA | NA | .001 |
| Covariate . | Odds ratio . | 95.0% CI for odds ratio . | P . | |
|---|---|---|---|---|
| Lower . | Upper . | |||
| Hemoglobin < 7.6 g/dL | 2.12 | 1.45 | 3.10 | < .001 |
| Hemoglobin ≥ 7.6 g/dL and ≤ 8.5 g/dL | 1.19 | 0.81 | 1.76 | .371 |
| Hemoglobin ≥ 8.6 g/dL (reference) | 1.00 | NA | NA | NA |
| SBP < 104 mmHg (reference) | 1.00 | NA | NA | NA |
| SBP ≥ 104 and ≤ 112 mmHg | 1.55 | 1.06 | 2.27 | .025 |
| SBP ≥ 113 mmHg | 1.73 | 1.18 | 2.54 | .005 |
| Sex (female, reference) | 1.42 | 1.04 | 1.93 | .026 |
| Constant | 0.26 | NA | NA | .001 |
The reference category for hemoglobin was the third tertile (hemoglobin ≥ 8.6 g/dL). Participants with hemoglobin in the second tertile had a higher risk of SCI compared with the third tertile. The reference category for SBP was the first tertile (SBP < 104 mmHg). Participants in the second and third tertiles had a higher risk of SCI compared with those in the first tertile.
NA indicates not applicable.