Table 1.

Descriptive analysis, according to year and month, of ST-elevation myocardial infarction (STEMI), non-ST-elevation myocardial infarction (NSTEMI), coronavirus disease 2019 (COVID-19), environmental pollution, and weather features.

Feature	January		February		March
	2019	2020	2019	2020	2019	2020
STEMI per day	0.4896	0.5256	0.4643	0.4746	0.5503	0.3187
STEMI requiring PCI per day	0.4782	0.5085	0.4433	0.4462	0.5256	0.3169
NSTEMI per day	0.7742	0.7647	0.6722	0.6410	0.7191	0.4061
NSTEMI requiring PCI per day	0.5275	0.5439	0.4622	0.4442	0.5019	0.2979
STEMI/NSTEMI per day ratio	0.3733	0.3862	0.4774	0.3997	0.4311	0.2685
STEMI/NSTEMI requiring PCI per day ratio	0.4334	0.362	0.4874	0.4284	0.4019	0.2152
COVID-19
Cases	0	0	0	0.17±0.65	0	99.65±77.71
Deaths	0	0	0	0	0	5.23±5.13
Tests	0	0	0	23.41±81.19	0	1096.71±1274.65
Environmenta
Benzene	1.825±0.682	2.303±0.689	1.479±0.587	1.341±0.421	1.047±0.256	0.917±0.272
Nitric oxide	29.30±18.55	41.54±20.70	21.05±12.14	19.69±12.25	11.60±5.12	5.09±3.03
Nitrogen dioxide	34.25±9.83	42.25±11.51	33.63±11.97	32.44±10.69	28.97±7.93	17.93±7.09
Nitrogen oxides	92.09±41.20	118.64±44.53	76.03±31.21	70.18±29.29	55.45±15.77	28.97±12.33
Ozone	31.29±10.69	22.39±9.74	43.11±13.00	39.20±13.42	55.22±11.22	55.33±9.76
Sulfur dioxide	1.25±0.43	2.64±7.65	1.32±0.52	3.27±10.83	0.86±0.42	4.31±14.72
Particulate matter <2.5 μm	17.209±8.288	26.589±10.055	17.902±9.305	15.760±7.451	13.221±4.529	13.267±6.827
Particulate matter <10 μm	25.621±10.729	39.185±11.008	28.397±11.195	27.028±9.671	24.623±7.581	23.638±11.214
Weather
Temperature (°C)	6.46±2.22	7.81±2.26	9.51±1.70	10.66±2.18	12.44±1.56	11.32±2.16
Humidity (%)	74.66±17.39	80.45±9.50	66.50±20.39	74.68±15.21	68.58±17.84	74.35±11.52
Rainfall (mm)	2.29±4.71	1.59±8.11	0.64±5.16	1.10±2.43	0.27±1.10	2.88±6.33

^aAll pollutants are expressed as μg/m3; PCI=percutaneous coronary intervention; PM=particulate matter.