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Proportion of OSA in each stage after stroke.
| High-risk OSA | Low-risk OSA | |
| At admission | 1,011 (74.7%) | 343 (25.3%) |
| 3 months after stroke | 1,015 (75.8%) | 325 (24.2%) |
| 6 months after stroke | 1,033 (78%) | 291 (22%) |
| 4 years after stroke | 937 (77.4%) | 273 (22.6%) |
