Table 1.
Distribution of elevated HI days and emergency department visit data for same-day exposure used in single-day threshold analysis in Anchorage, Fairbanks, and the Matanuska-Susitna Valley, Alaska, 2015–2019.
| Total | HI threshold | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 21.1°C (70°F) | 22.2°C (72°F) | 23.3°C (74°F) | 24.4°C (76°F) | 25.6°C (78°F) | 26.7°C (80°F) | 27.8°C (82°F) | 28.9°C (84°F) | 30°C (86°F) | ||
| Number of days above each HI threshold by study area | ||||||||||
| Anchorage [ (%)] | 460 (100) | 163 (35.4) | 123 (26.7) | 91 (19.8) | 65 (14.1) | 42 (9.1) | 19 (4.1) | 9 (2.0) | 2 (0.4) | 0 (0.0) |
| Fairbanks North Star [ (%)] | 460 (100) | 227 (49.3) | 182 (39.6) | 151 (32.8) | 110 (23.9) | 80 (17.4) | 54 (11.7) | 24 (5.2) | 9 (2.0) | 3 (0.7) |
| Matanuska-Susitna [ (%)] | 460 (100) | 140 (30.4) | 105 (22.8) | 79 (17.2) | 53 (11.5) | 26 (5.7) | 15 (3.3) | 8 (1.7) | 5 (1.1) | 1 (0.2) |
| Number of ED visits on elevated HI days by health outcome | ||||||||||
| Asthma [ (%)] | 2,911 (100) | 1,111 (38.2) | 866 (29.7) | 668 (22.9) | 490 (16.8) | 340 (11.7) | 194 (6.7) | 101 (3.5) | 31 (1.1) | 3 (0.1) |
| COPD [ (%)] | 2,158 (100) | 777 (36.0) | 600 (27.8) | 455 (21.1) | 327 (15.2) | 212 (9.8) | 95 (4.4) | 38 (1.8) | 13 (0.6) | 3 (0.1) |
| Pneumonia [ (%)] | 2,081 (100) | 718 (34.5) | 555 (26.7) | 411 (19.8) | 291 (14.0) | 205 (9.9) | 118 (5.7) | 56 (2.7) | 20 (1.0) | 5 (0.2) |
| Bronchitis [ (%)] | 1,972 (100) | 648 (32.9) | 509 (25.8) | 372 (18.9) | 251 (12.7) | 154 (7.8) | 94 (4.8) | 38 (1.9) | 17 (0.9) | 6 (0.3) |
| Arrhythmia [ (%)] | 1,617 (100) | 592 (36.6) | 449 (27.8) | 344 (21.3) | 233 (14.4) | 152 (9.4) | 73 (4.5) | 33 (2.0) | 10 (0.6) | 2 (0.1) |
| Cerebrovascular [ (%)] | 434 (100) | 159 (36.6) | 114 (26.3) | 97 (22.4) | 70 (16.1) | 47 (10.8) | 27 (6.2) | 15 (3.5) | 7 (1.6) | 2 (0.5) |
| Ischemic [ (%)] | 200 (100) | 76 (38.0) | 63 (31.5) | 51 (25.5) | 36 (18.0) | 25 (12.5) | 14 (7.0) | 7 (3.5) | 1 (0.5) | 1 (0.5) |
| Myocardial infarction [ (%)] | 81 (100) | 33 (40.7) | 26 (32.1) | 23 (28.4) | 17 (21.0) | 10 (12.3) | 5 (6.2) | 1 (1.2) | 0 (0.0) | 0 (0.0) |
| Heart failure [ (%)] | 441 (100) | 152 (34.5) | 113 (25.6) | 91 (20.6) | 67 (15.2) | 42 (9.5) | 23 (5.2) | 9 (2.0) | 4 (0.9) | 1 (0.2) |
| Heat illness [ (%)] | 35 (100) | 31 (88.6) | 29 (82.9) | 28 (80.0) | 27 (77.1) | 23 (65.7) | 22 (62.9) | 13 (37.1) | 8 (22.9) | 0 (0.0) |
Note: COPD, chronic obstructive pulmonary disease; HI, heat index.