Multivariable models of factors associated with documentation of DS
| Variable | Patients with and without NIHSS scores, N=790 811 | Patients with NIHSS scores, N=633 271 | ||
| OR (95% CI) | P value | OR (95% CI) | P value | |
| Hospitalised in SUs | 1.50 (1.48 to 1.52) | <0.0001 | 1.38 (1.36 to 1.40) | <0.0001 |
| Medical history | ||||
| Stroke/TIA | 0.87 (0.86 to 0.88) | <0.0001 | 0.89 (0.88 to 0.91) | <0.0001 |
| Hypertension | 1.16 (1.14 to 1.17) | <0.0001 | 1.13 (1.11 to 1.14) | <0.0001 |
| Diabetes mellitus | 1.10 (1.08 to 1.11) | <0.0001 | 1.10 (1.08 to 1.12) | <0.0001 |
| Atrial fibrillation | 1.19 (1.16 to 1.22) | <0.0001 | 1.20 (1.16 to 1.24) | <0.0001 |
| Smoking | 1.09 (1.07 to 1.10) | <0.0001 | 1.02 (1.01 to 1.04) | 0.0006 |
| Hospital grade (tertiary vs secondary) | 0.98 (0.97 to 1.00) | 0.0061 | 0.97 (0.96 to 0.99) | <0.0001 |
| Region, Western (reference) | ||||
| Eastern | 0.95 (0.94 to 0.97) | <0.0001 | 1.00 (0.98 to 1.02) | 0.8113 |
| Central | 0.75 (0.74 to 0.76) | <0.0001 | 0.81 (0.80 to 0.83) | <0.0001 |
| Admission NIHSS score (per 1-point increase)* | — | — | 0.99 (0.99 to 0.99) | <0.0001 |
The first column includes all patients; the second column is restricted to patients with available admission NIHSS scores.
*Admission NIHSS score not included due to missing data in 19.9% of patients.
DS, dysphagia screening; NIHSS, National Institute of Health Stroke Scale; SU, stroke unit; TIA, transient ischaemic attack.