Association Between Air Temperature and the Incidence of Acute Coronary Heart Disease in Northeast China

Figures & data

Table 1 The Characteristics of CHD Patients by Levels of Daily CHD Hospitalizations

	CHD Daily Hospitalization Quartile
		1(655)	2(1383)	3(1884)	4(2853)	Total(6775)
Mean±SD
Age	67.13±11.34	66.39±11.42	65.59±10.92	65.26±11.15	65.76±11.18	<0.001
N (%)
Female	342(52.20%)	695(50.30%)	988(52.40%)	1511(53.00%)	3536(52.20%)	0.545
Male	313(47.80%)	688(49.70%)	896(47.60%)	1342(47.00%)	3239(47.80%)
Season
Cold season	288(43.97%)	646(46.71%)	993(52.71%)	1894(66.39%)	3821(56.40%)	<0.001
Warm season	367(56.03%)	737(53.29%)	891(47.29%)	959(33.61%)	2954(43.60%)

Table 2 The Summary of Descriptive Statistics During the Weather Conditions in 2017–2019

	Daily Weather Conditions			Mean±SD
		25%	50%	75%
Cold season (Oct–Mar)
Air temperature	−10.10	−4.80	3.20	−3.46±8.41
Air pressure	996.3	1001.10	1005.4	100.87±6.73
Wind velocity	1.80	2.30	3.00	2.47±0.80
Relative Humidity	33.00	40.00	48.00	41.57±11.59
Sunshine duration	7.00	7.90	8.80	7.41±2.89
Water vapor pressure	0.10	0.30	1.20	1.13±1.73
Warm season (Apr–Sep)
Air temperature	15.40	20.30	24.10	19.57±6.21
Air pressure	982.90	986.60	990.7	986.97±5.71
Wind velocity	2.00	2.50	3.00	2.70±0.93
Relative Humidity	32.00	53.00	70.00	51.91±21.24
Sunshine duration	6.90	8.40	11.30	8.39±3.96
Water vapor pressure	0.80	2.00	11.50	6.84±8.47
All season
Air temperature	−5.00	9.20	20.10	7.87±13.69
Air pressure	986.20	993.70	1001.30	994.03±9.35
Wind speed	1.90	2.40	3.10	2.58±0.87
Humidity	32.50	43.00	58.00	46.66±17.79
Sunshine hours	6.90	7.92	9.80	7.89±3.33
Water vapor pressure	0.20	0.90	3.20	3.94±6.71

Table 3 The Relationship Between Air Temperature and CHD Hospitalizations

	CHD Daily Hospitalization Quartile
	Model 1			Model 2
	≤66	>67	ALL	≤66	>67	ALL
Air temperature
1	2.78 (1.72, 4.48)	2.33 (1.44, 3.77)	2.57 (1.83, 3.60)	5.61 (2.35, 13.40)	2.43 (1.02, 5.77)	3.69 (2.01, 6.77)
2	3.62 (2.22, 5.92)	2.58 (1.60, 4.15)	3.01 (2.14, 4.23)	5.86 (2.79, 12.32)	2.71 (1.32, 5.58)	3.86 (2.31, 6.44)
3	2.13 (1.32, 3.41)	1.58 (0.97, 2.56)	1.86 (1.33, 2.60)	2.46 (1.32, 3.41)	1.69 (0.94,3.04)	2.09 (1.39,3.14)
4	Reference	Reference	Reference	Reference	Reference	Reference

Notes: Model 1: Unadjusted; Model 2: Adjusted for air pressure, wind velocity, relative humidity, sunshine duration, water vapor pressure.

Table 4 The Relationship Between Air Temperature and CHD Hospitalizations After Adjusting Other Meteorological Factor in Cold Season and Warm Season

Air Temperature	CHD Daily Hospitalization Quartile
	Model 1			Model 2
	≤66	>67	ALL	≤66	>67	ALL
Cold season
1	0.79 (0.40, 1.60)	1.20 (0.63,2.27)	1.03 (0.65,1.65)	1.11 (0.45,2.75)	1.01 (0.46,2.25)	1.03 (0.57,1.87)
2	0.60 (0.31,1.19)	1.21 (0.63,2.33)	0.92 (0.58,1.47)	0.73 (0.33,1.59)	1.09 (0.53,2.25)	0.89 (0.53,1.50)
3	0.74 (0.37,1.48)	1.42 (0.74,2.73)	1.09 (0.68,1.73)	0.83 (0.40,1.73)	1.40 (0.69,2.87)	1.08 (0.65,1.77)
4	Reference	Reference	Reference	Reference	Reference	Reference
Warm season
1	3.68 (1.81,7.46)	2.47 (1.24,4.91)	3.02 (1.85,4.94)	5.09 (2.00,12.94)	3.32 (1.27,8.71)	4.48 (2.32,8.68)
2	3.53 (1.77,7.04)	2.35 (1.16,4.76)	3.01 (1.84,4.92)	4.21 (1.90,9.33)	2.77 (1.35,6.27)	3.71 (2.11,6.51)
3	2.24 (1.11,4.50)	1.91 (0.96,3.81)	2.07 (1.27,3.37)	2.61 (1.28,5.33)	2.05 (1.04,4.20)	2.41 (1.46.3.98)
4	Reference	Reference	Reference	Reference	Reference	Reference

Notes: Model 1: Unadjusted; Model 2: Adjusted for air pressure, wind velocity, relative humidity, sunshine duration, water vapor pressure.