. 2019 Jan 30;8(3):e010995. doi: 10.1161/JAHA.118.010995

Table 2.

Projected Increase in Maternal Heat Exposure During Early Pregnancy by Different Metrics and Region (2025–2035 Versus 1995–2005) in the United States in Spring (per Pregnancy)

Regions	Maximum Temperature Criterion^a	EHE 90						EHE 95
		EHD Counts		EHE Frequency		EHE Duration		EHD Counts		EHE Frequency		EHE Duration
		Increase	95% CI	Increase	95% CI	Increase	95% CI	Increase	95% CI	Increase	95% CI	Increase	95% CI
South (AR/TX)	Maximum	1.35	0.85–1.85	0.14	0.06–0.21	1.37	1.08–1.66	1.12	0.79–1.48	0.21	0.12–0.30	0.60	0.41–0.78
	Median	1.96	1.48–2.45	0.25	0.18–0.33	1.26	0.95–1.59	1.90	1.56–2.27	0.24	0.18–0.32	1.18	0.94–1.43
	Minimum	1.21	0.79–1.61	0.07	0.00–0.14	0.62	0.41–0.84	0.80	0.55–1.07	0.11	0.05–0.17	0.37	0.20–0.55
West (CA)	Maximum	0.62	0.19–1.05	−0.03	−0.11–0.04	0.46	0.17–0.73	0.47	0.14–0.80	0.10	0.03–0.17	0.27	0.05–0.49
	Median	0.63	0.18–1.06	0.05	−0.04–0.13	0.27	0.01–0.51	0.15	−0.11–0.42	−0.01	−0.07–0.06	0.25	0.05–0.44
	Minimum	1.82	1.38–2.24	0.30	0.23–0.37	0.96	0.68–1.24	0.54	0.25–0.82	0.03	−0.03–0.09	0.28	0.08–0.48
Midwest (IA)	Maximum	1.53	1.06–1.98	0.28	0.19–0.37	1.14	0.92–1.34	1.41	1.10–1.72	0.38	0.28–0.47	0.83	0.65–0.98
	Median	0.95	0.48–1.36	0.26	0.18–0.33	0.49	0.25–0.71	1.30	0.95–1.61	0.24	0.15–0.33	0.79	0.61–0.95
	Minimum	1.27	0.78–1.68	0.17	0.09–0.24	0.34	0.09–0.57	1.09	0.78–1.37	0.10	0.01–0.18	0.68	0.51–0.85
Southeast (NC/GA)	Maximum	1.18	0.69–1.66	0.15	0.08–0.23	0.51	0.21–0.80	0.60	0.31–0.88	0.17	0.11–0.24	0.30	0.12–0.48
	Median	0.84	0.41–1.27	0.12	0.05–0.18	0.57	0.32–0.84	0.32	0.08–0.56	0.19	0.12–0.26	0.09	−0.04–0.22
	Minimum	0.57	0.23–0.93	0.08	0.03–0.13	0.13	−0.07–0.32	0.24	0.02–0.45	0.24	0.18–0.31	0.21	0.07–0.34
Northeast (NY)	Maximum	1.41	0.99–1.80	0.14	0.06–0.20	0.91	0.71–1.11	0.82	0.56–1.07	0.24	0.16–0.32	0.49	0.34–0.62
	Median	1.29	0.87–1.67	0.10	0.02–0.18	0.43	0.23–0.62	0.74	0.48–0.99	0.18	0.09–0.25	0.44	0.30–0.58
	Minimum	0.51	0.12–0.88	0.06	−0.01–0.12	0.28	0.09–0.46	0.01	−0.20–0.23	−0.12	−0.19–−0.05	−0.05	−0.18–0.07
Southwest (UT)	Maximum	1.37	0.88–1.83	0.33	0.25–0.42	0.46	0.17–0.75	0.41	0.09–0.71	0.10	0.02–0.17	−0.06	−0.28–0.15
	Median	2.18	1.68–2.67	0.27	0.20–0.34	1.07	0.75–1.37	1.16	0.82–1.46	0.40	0.32–0.48	0.24	0.02–0.44
	Minimum	2.46	1.92–2.93	0.35	0.27–0.42	1.07	0.73–1.39	1.53	1.20–1.84	0.42	0.34–0.49	0.76	0.53–0.97

EHD indicates excessively hot day; EHE, extreme heat event.

Maximum, median, or minimum grid‐cell daily maximum temperature T _max‐cell was used to represent the regional daily maximum temperature, T _max‐region.