Table 4.

Case–control study results associating indoor heat exposure and respiratory or cardiovascular cases vs. controls. The analysis was conducted on the full patient care report record

Cases	Independent variable	Odds ratio (95% CI)	s.e.	P-value
Respiratory (N = 809, 338 cases, 471 controls)	Intercept	0.64 (0.24, 1.74)	0.51	0.387
	Indoor heat index >26 °C	1.43 (0.97, 2.10)	0.20	0.071
	Time of day (04:00–07:59)	0.84 (0.48, 1.45)	0.28	0.523
	Time of day (08:00–11:59)	0.58 (0.34, 0.97)	0.26	0.039
	Time of day (12:00–15:59)	0.65 (0.39, 1.08)	0.26	0.099
	Time of day (16:00–19:59)	0.62 (0.38, 1.01)	0.25	0.054
	Time of day (20:00–23:59)	0.76 (0.45, 1.27)	0.26	0.296
	Patient age (years)	1.01 (1.00, 1.01)	0.004	0.041
	Income $10 000 (neighborhood)	0.99 (0.98, 1.00)	0.004	0.132
	Hispanic (% neighborhood)	1.01 (0.99, 1.02)	0.006	0.136
	Preexisting condition	1.88 (1.36, 2.59)	0.16	<0.001
	PM2.5, average 0–48 h prior	0.96 (0.92, 1.01)	0.02	0.102
Cardiovascular (N = 762, 291 cases, 471 controls)	Intercept	0.15 (0.06, 0.35)	0.45	<0.001
	Indoor heat index >26 °C	0.85 (0.55, 1.31)	0.22	0.472
	Time of day (04:00–07:59)	0.97 (0.53, 1.79)	0.31	0.928
	Time of day (08:00–11:59)	1.29 (0.75, 2.21)	0.28	0.359
	Time of day (12:00–15:59)	1.05 (0.60, 1.81)	0.28	0.874
	Time of Day (16:00–19:59)	0.79 (0.46, 1.37)	0.28	0.401
	Time of day (20:00–23:59)	0.99 (0.56, 1.73)	0.29	0.958
	Patient age (years)	1.01 (1.00, 1.02)	0.004	0.006
	Black (% neighborhood)	0.99 (0.99, 1.00)	0.003	0.037
	Hispanic (% neighborhood)	1.01 (1.00, 1.02)	0.004	0.037
	Preexisting condition	1.89 (1.36, 2.63)	0.17	<0.001
	Renters (% neighborhood)	0.99 (0.99, 1.00)	0.002	0.073
	Ozone (average previous 24 h) per 10 ppb	1.22 (0.98, 1.51)	0.11	0.070