Effect of cold spells on the risk of ischaemic SCD by severity of coronary stenosis
| Moderate stenosis | Severe stenosis | All cases | |
| All cases, n (%) | 512 (19.91) | 2060 (80.09) | 2572 (100.00) |
| All cases, OR (95% CI) | 0.97 (0.37 to 2.55) | 1.60 (1.11 to 2.30) | 1.49 (1.06 to 2.09) |
| Diagnosis of IHD before death | |||
| Yes, n (%) | 101 (12.27) | 722 (87.73) | 823 (100.00) |
| No, n (%) | 411 (23.50) | 1338 (76.50) | 1749 (100.00) |
| Yes, OR (95% CI) | – | 1.24 (0.67 to 2.31) | 1.14 (0.61 to 2.10) |
| No, OR (95% CI) | 1.18 (0.44 to 3.17) | 1.85 (1.18 to 2.91) | 1.70 (1.13 to 2.56) |
| No CCB therapy | 1.17 (0.44 to 3.14) | 2.07 (1.36 to 3.14) | 1.88 (1.28 to 2.75) |
| No statin therapy | 0.72 (0.21 to 2.46) | 1.66 (1.06 to 2.59) | 1.46 (0.97 to 2.22) |
CCB, calcium-channel blockers; IHD, ischaemic heart disease; SCD, sudden cardiac death.