All-cause mortality stratified by age group
| Variables | 3 months | 1 year | After 1 year | |||
| HR | 95% CI | HR | 95% CI | HR | 95% CI | |
| Model 1* | ||||||
| Total cohort | ||||||
| Underweight | 1.96 | 1.31 to 2.93 | 1.89 | 1.37 to 2.59 | 1.61 | 1.25 to 2.09 |
| Normal weight | 1.00 | |||||
| Overweight | 0.60 | 0.42 to 0.85 | 0.70 | 0.54 to 0.90 | 0.83 | 0.70 to 0.98 |
| Obese | 0.67 | 0.48 to 0.94 | 0.63 | 0.48 to 0.82 | 0.63 | 0.53 to 0.82 |
| Age <65 years | ||||||
| Underweight | 3.75 | 1.66 to 8.47 | 3.49 | 1.36 to 7.22 | 2.54 | 1.32 to 4.89 |
| Normal weight | 1.00 | 1.00 | 1.00 | |||
| Overweight | 0.81 | 0.41 to 1.56 | 0.83 | 0.48 to 1.46 | 0.91 | 0.61 to 1.34 |
| Obese | 0.28 | 0.12 to 0.63 | 0.53 | 0.30 to 0.91 | 0.58 | 0.39 to 0.86 |
| Age≥65 years | ||||||
| Underweight | 1.57 | 1.00 to 2.47 | 1.59 | 1.12 to 2.25 | 1.46 | 1.10 to 1.93 |
| Normal weight | 1.00 | 1.00 | 1.00 | |||
| Overweight | 0.54 | 0.36 to 0.81 | 0.67 | 0.51 to 0.89 | 0.82 | 0.68 to 0.99 |
| Obese | 0.89 | 0.62 to 1.27 | 0.70 | 0.52 to 0.93 | 0.6 | 0.54 to 0.82 |
| Model 2† | ||||||
| Total cohort | ||||||
| Underweight | 1.55 | 1.00-2.47 | 1.54 | 1.09-2.18 | 1.43 | 1.09-1.87 |
| Normal weight | 1.00 | 1.00 | 1.00 | |||
| Overweight | 0.78 | 0.54-1.13 | 0.89 | 0.69-1.14 | 0.98 | 0.82-1.16 |
| Obese | 0.81 | 0.56-1.16 | 0.73 | 0.55-0.99 | 0.66 | 0.54-0.82 |
| Age <65 years | ||||||
| Underweight | 0.64 | 0.15 to 2.82 | 0.73 | 0.22 to 2.44 | 0.98 | 0.41 to 2.35 |
| Normal weight | 1.00 | 1.00 | 1.00 | |||
| Overweight | 1.27 | 0.59 to 2.74 | 1.36 | 0.73 to 2.54 | 1.43 | 0.92 to 2.21 |
| Obese | 0.43 | 0.17 to 1.12 | 0.72 | 0.40 to 1.31 | 0.77 | 0.49 to 1.21 |
| Age≥65 years | ||||||
| Underweight | 1.49 | 0.92 to 2.41 | 1.50 | 1.03 to 2.19 | 1.42 | 1.06 to 1.92 |
| Normal weight | 1.00 | 1.00 | 1.00 | |||
| Overweight | 0.59 | 0.39 to 0.91 | 0.77 | 0.58 to 1.02 | 0.91 | 0.75 to 1.10 |
| Obese | 0.96 | 0.65 to 1.44 | 0.73 | 0.52 to 1.03 | 0.65 | 0.52 to 0.83 |
*Model 1 was adjusted for age, gender and smoking status.
†Model 2 adjusted the following covariates in addition to what were controlled in Model 1: comorbidities (diabetes, old stroke, atrial fibrillation, active cancer, anaemia, renal disease, liver disease, hypercholesterolaemia, depression, dementia, any complications, initial systolic blood pressure status, total cholesterol, initial glucose level and Charlson comorbidity index), enrolment year, stroke severity measured using the NIHSS score, treatment modalities (any thrombolysis, tissue plasminogen activator, intra-arterial thrombolysis, mechanical thrombectomy and stent insertion) and statin use.
NIHSS, National Institute of Health Stroke Scale.