Table 4.
2 × 2 table for example 2
| Status of stroke | ||||
| yes | no | ∑ | ||
| Exposure | current smoker | 420 | 10099 | 10519 |
| never-smoker | 153 | 4665 | 4818 | |
| ∑ | 573 | 14764 | 15337 | |
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