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Table 1 Characteristics of study subjects, by period

From: Changes in triggering of ST-elevation myocardial infarction by particulate air pollution in Monroe County, New York over time: a case-crossover study

Characteristic All Years
2005–2016
(N = 921)a
n (%)
Before
2005–2007
(N = 249)a
n (%)
During
2008–2013
(N = 372)a
n (%)
After
2014–2016
(N = 300)a
n (%)
Age, years
 Missing b 4 (0) 2(1) 2(1) 0(0)
 < 50 171 (19) 36 (15) 75 (20) 60 (20)
 50–59 224 (24) 50 (20) 99 (27) 75 (25)
 60–69 245 (27) 59 (24) 100 (27) 86 (29)
 70–79 157 (17) 52 (21) 56 (15) 49 (16)
 ≥ 80 120 (13) 50 (20) 40 (11) 30 (10)
 Mean ± standard deviation 63 ± 14 66 ± 15 61 ± 14 62 ± 13
Male 658 (71) 165 (66) 266 (72) 227 (76)
Race
 Missing b 256 (28) 45(18) 87 (23) 124 (41)
 Caucasian 550 (83) 165 (81) 238 (84) 147 (84)
 African American 82 (12) 28 (14) 34 (12) 20 (11)
 Asian 16 (2) 3 (1) 9 (3) 4 (2)
 Other/unknown 17 (3) 8 (4) 4 (1) 5 (3)
Clinical presentation (may have more than one)
 Missing b 134 (15) 45 (18) 87 (23) 2(1)
 Prior MI 122 (15) 38 (19) 42 (15) 42 (14)
 Prior CABG 50 (6) 22 (11) 15 (5) 13 (4)
 CVD 41 (5) 14 (7) 10 (4) 17 (6)
 Smoking 246 (31) 48 (24) 91 (32) 107 (36)
 Hypertension 525 (67) 129 (63) 199 (70) 197 (66)
 Dyslipidemia 424 (54) 92 (45) 168 (59) 164 (55)
 Diabetes 189 (24) 59 (29) 57 (20) 73 (24)
 Prior HF 41 (5) 20 (10) 13 (5) 8 (3)
BMI (kg/m2)
 Missing b 162 (18) 71 (29) 90(24) 1(0)
 Normal (< 25) 179 (24) 37 (21) 74 (26) 68 (23)
 Overweight (25 ≤ BMI < 30) 288 (38) 67 (38) 95 (34) 126 (42)
 Obesity (30 ≤ BMI < 35) 195 (26) 46 (26) 85 (30) 64 (21)
 Severe Obesity (BMI ≥ 35) 97 (13) 28 (16) 28 (10) 41 (14)
 Mean ± SD 29 ± 6 29 ± 6 29 ± 5 29 ± 6
Left ventricular ejection fraction
 Missing b 374 (41) 249(100) 108 (29) 17 (6)
 ≤ 35% 104 (19) 50 (19) 54 (19)
 36% - ≤45% 136 (25) 73 (28) 63 (22)
 > 45% 307 (56) 141 (53) 166 (59)
 Mean ± SD 47 ± 13 47 ± 12 49 ± 13
  1. Data are N (%) or Mean ± SD. For any given characteristic, the denominator of percentage is all STEMIs with available data on that characteristic
  2. aNs are the number of STEMIs. There were a total of 921 STEMIs among 912 patients
  3. bDenominator is all STEMIs (N = 921 for “All years”, N = 249 for “Before”, N = 372 for “During”, and N = 300 for “After”)