Table 3 Associations between winter season and deaths among older cardiovascular inpatients
Cardiovascular disease subtypes | Winter season*(n = 101,704) | Summer season*(n = 98,748) | RRs (95% CI)† | P-value | ||
|---|---|---|---|---|---|---|
Deaths/No. | Death rate (%) | Deaths/No. | Death rate (%) | |||
Ischemic heart disease (I20-I25) | 1,826/42,761 | 4.3 | 1,358/38,946 | 3.5 | 1.22 (1.13, 1.31) | < 0.01 |
Angina pectoris (I20) | 145/19,367 | 0.8 | 113/17,653 | 0.6 | 1.16 (0.90, 1.48) | 0.25 |
Acute ischemic heart disease (I21-I24) | 1,274/9,342 | 13.6 | 942/7,893 | 11.9 | 1.14 (1.04,1.25) | 0.01 |
Chronic ischemic heart disease (I25) | 407/14,052 | 2.9 | 303/13,400 | 2.3 | 1.28 (1.10, 1.49) | < 0.01 |
Pulmonary heart disease (I26-I28) | 194/1,753 | 11.1 | 121/1,477 | 8.2 | 1.42 (1.10, 1.83) | < 0.01 |
Cardiac arrhythmias (I44-I49) | 248/7,221 | 3.4 | 160/7,737 | 2.1 | 1.67 (1.36, 2.05) | < 0.01 |
Heart failure (I50) | 372/4,454 | 8.4 | 243/3,755 | 6.5 | 1.30 (1.09, 1.54) | < 0.01 |
Cerebrovascular disease (I60-I69) | 1,691/27,829 | 6.1 | 1,328/28,975 | 4.6 | 1.35 (1.25, 1.45) | < 0.01 |
Hemorrhagic stroke (I60-I62) | 575/3,378 | 17.0 | 439/2,825 | 15.5 | 1.12 (0.98, 1.29) | 0.10 |
Ischemic stroke (I63) | 924/18,647 | 5.0 | 768/19,721 | 3.9 | 1.30 (1.17, 1.43) | < 0.01 |
Other cerebrovascular diseases (I64-I69) | 192/5,804 | 3.3 | 121/6,429 | 1.9 | 1.78 (1.40, 2.25) | < 0.01 |
Rheumatic heart disease (I00-I09) | 63/979 | 6.4 | 57/1,032 | 5.5 | 1.17 (0.80, 1.71) | 0.42 |
Hypertensive diseases (I10-I15) | 35/8,389 | 0.4 | 34/7,889 | 0.4 | 1.07 (0.66, 1.73) | 0.78 |
Other heart disease (I30-I42, I51, I52) | 73/1,587 | 4.6 | 72/1,648 | 4.4 | 1.03 (0.74, 1.45) | 0.85 |
Diseases of arteries and arterioles (I70-I79) | 139/3,969 | 3.5 | 114/4,024 | 2.8 | 1.22 (0.94, 1.57) | 0.13 |
Other circulatory diseases (I80-I89, I95-I99) | 21/2,762 | 0.8 | 16/3,214 | 0.5 | 1.47 (0.76, 2.86) | 0.26 |