Table 1.
Patients Characteristics of the acute myocardial infarction hospital admissions in South Korea during study period (1 January 2004–31 December 2012).
| Study Period | Hot Weather | Cold Weather | Warm Weather | p-Value | |
|---|---|---|---|---|---|
| No. of Patients | 179,099 | 42,831 | 45,428 | 90,840 | |
| Age (mean ± SD) | 64.53 ± 13.25 | 64.22 ± 13.26 | 64.66 ± 13.19 | 64.61 ± 13.26 | |
| Gender | |||||
| Male | 119,037 (66.46) | 28,789 (67.22) | 30,012 (66.06) | 60,236 (66.31) | <0.0001 |
| Female | 60,062 (33.54) | 14,042 (32.78) | 15,416 (33.94) | 30,604 (33.69) | |
| Insurance type | |||||
| NHI | 165,276 (92.28) | 39,481 (92.18) | 41,749 (91.9) | 84,046 (92.52) | <0.0001 |
| Medicaid | 13,823 (7.72) | 3350 (7.82) | 3679 (8.1) | 6794 (7.48) | |
| Insurance premium a | |||||
| Low | 59,108 (33.00) | 14,044 (32.79) | 15,381 (33.86) | 29,683 (32.68) | <0.0001 |
| Medium | 54,329 (30.33) | 12,957 (30.25) | 13,940 (30.69) | 27,432 (30.20) | |
| High | 65,662 (36.66) | 15,830 (36.96) | 16,107 (35.46) | 33,725 (37.13) | |
| Area b | |||||
| Urban | 110,382 (61.63) | 26,200 (61.17) | 28,416 (62.55) | 55,766 (61.39) | <0.0001 |
| Rural | 68,717 (38.37) | 16,631 (38.83) | 17,012 (37.45) | 35,074 (38.61) | |
Hot weather (summer): June–August; Cold weather (winter): December–February; Warm weather (spring and autumn): March–May and September–November; NHI: National health Insurance for general populations; Medicaid: Public health care benefits for the poor; a Insurance premium for NHI was calculate base on the value of properties and household income; b Area was divided base on registered population. Urban area with more than 500,000 and rural area with less than 500,000.