. 2023 May 24;131(5):057009. doi: 10.1289/EHP11363

Table 8.

ORs and 95% CIs for ED visits for HI on lag day 4 above vs. below the threshold from single-day lag models in Anchorage, Fairbanks, and the Matanuska-Susitna Valley, Alaska, 2015–2019.

Reason for ED visit	Number of cases	21.1°C (70°F) HI threshold	22.2°C (72°F) HI threshold	23.3°C (74°F) HI threshold	24.4°C (76°F) HI threshold	25.6°C (78°F) HI threshold	26.7°C (80°F) HI threshold	27.8°C (82°F) HI threshold	28.9°C (84°F) HI threshold	30°C (86°F) HI threshold
Heat illness	35	2.43 (1.15, 5.10)^a	1.51 (0.74, 3.05)	1.89 (0.91, 3.92)	1.32 (0.59, 2.94)	1.63 (0.65, 4.10)	2.56 (0.98, 6.68)	3.36 (1.04, 10.90)^a	5.33 (1.28, 22.18)^a	—
Asthma	2,911	0.89 (0.82, 0.97)^a	0.90 (0.82, 0.98)^a	0.92 (0.84, 1.02)	0.93 (0.83, 1.04)	1.03 (0.90, 1.17)	1.08 (0.91, 1.28)	1.04 (0.81, 1.33)	0.80 (0.50, 1.28)	0.27 (0.04, 1.97)^b
COPD	2,158	0.88 (0.80, 0.97)^a	0.88 (0.79, 0.98)^a	0.89 (0.80, 1.00)	0.91 (0.80, 1.04)	0.82 (0.69, 0.96)^a	0.84 (0.67, 1.06)	0.79 (0.56, 1.10)	0.86 (0.51, 1.48)	0.61 (0.15, 2.53)
Pneumonia	2,081	0.91 (0.82, 1.01)	0.95 (0.85, 1.05)	0.88 (0.78, 1.00)^a	0.87 (0.76, 1.00)	0.88 (0.74, 1.04)	0.91 (0.72, 1.14)	0.94 (0.68, 1.29)	0.97 (0.57, 1.65)	0.67 (0.16, 2.76)
Bronchitis	1,972	0.73 (0.66, 0.81)^a	0.74 (0.66, 0.83)^a	0.76 (0.67, 0.87)^a	0.76 (0.66, 0.89)^a	0.75 (0.63, 0.90)^a	0.75 (0.58, 0.96)^a	0.60 (0.40, 0.89)^a	0.55 (0.26, 1.18)	0.63 (0.15, 2.61)
Arrhythmia	1,617	0.91 (0.82, 1.02)	0.92 (0.81, 1.03)	0.88 (0.77, 1.00)	0.93 (0.80, 1.09)	0.91 (0.76, 1.10)	1.08 (0.86, 1.37)	1.23 (0.90, 1.68)	1.31 (0.78, 2.19)	1.04 (0.32, 3.39)
Cerebrovascular	434	0.97 (0.79, 1.21)	0.91 (0.73, 1.15)	0.96 (0.75, 1.23)	0.87 (0.65, 1.17)	0.83 (0.58, 1.19)	0.77 (0.48, 1.25)	0.64 (0.31, 1.35)	0.94 (0.33, 2.63)	—
Ischemia	200	0.94 (0.69, 1.30)	1.13 (0.81, 1.57)	1.28 (0.90, 1.83)	1.35 (0.91, 2.00)	1.22 (0.76, 1.97)	1.24 (0.69, 2.21)	1.37 (0.63, 2.98)	0.41 (0.06, 3.08)^b	—
Myocardial infarction	81	1.26 (0.75, 2.10)	1.49 (0.87, 2.53)	2.00 (1.14, 3.51)^a	3.06 (1.69, 5.55)^a	2.22 (1.09, 4.53)^a	2.04 (0.84, 4.96)	2.64 (0.80, 8.77)	—	—
Heart failure	441	1.02 (0.82, 1.25)	0.87 (0.69, 1.09)	0.91 (0.70, 1.17)	0.71 (0.52, 0.97)	0.82 (0.56, 1.18)	1.04 (0.67, 1.62)	0.60 (0.29, 1.25)	0.77 (0.24, 2.51)	1.48 (0.34, 6.50)

Note: Conditional logistic regression models adjusted for daily $particulate matter begin subscript 2.5 end subscript$ concentration were used to estimate ORs. —, no data; CI, confidence interval; COPD, chronic obstructive pulmonary disease; ED, emergency department; HI, heat index, OR, odds ratio.

^{^a}

95% CI does not include the null.

^{^b}

Only one ED visit related to the indicated health outcome occurred 4 d after an exposure (i.e., a day during which the HI exceeded the indicated threshold) during the study period.