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Table 4 Rate of STEMI associated with each interquartile range increase in pollutant concentration in the Before, During, and After periods

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

Lag hours IQR Before (2005–2007) During (2008–2013) After (2014–2016)
No. of STEMI OR 95%CI No. of STEMI OR 95%CI No. of STEMI OR 95%CI
PM2.5 (μg/m3)
 0 7.59 234 1.03 0.91, 1.17 339 1.07 0.92, 1.24 285 0.99 0.81, 1.21
 0–2 7.33 233 1.04 0.92, 1.18 333 1.04 0.90, 1.21 282 1.08 0.86, 1.34
 0–11 6.57 235 1.03 0.91, 1.15 336 1.01 0.87, 1.18 284 1.00 0.81, 1.24
 0–23 6.21 234 1.00 0.89, 1.13 335 1.00 0.85, 1.17 285 1.03 0.83, 1.28
 0–47 5.71 235 0.96 0.84, 1.09 328 0.98 0.83, 1.17 285 1.07 0.85, 1.34
 0–71 5.30 232 0.91 0.79, 1.05 321 0.98 0.82, 1.18 280 1.11 0.88, 1.41
AMP (particles/cm3)
 0 698 166 1.07 0.93, 1.23 328 1.07 0.93, 1.24 285 1.08 0.84, 1.38
 0–2 688 165 1.07 0.93, 1.23 322 1.03 0.89, 1.20 284 1.05 0.82, 1.35
 0–11 693 165 0.99 0.84, 1.18 328 1.08 0.90, 1.29 287 0.99 0.75, 1.29
 0–23 670 161 0.95 0.79, 1.14 327 1.05 0.87, 1.27 284 1.06 0.80, 1.39
 0–47 602 156 0.98 0.81, 1.19 324 1.01 0.83, 1.23 283 1.06 0.80, 1.42
 0–71 543 148 0.95 0.78, 1.16 321 0.97 0.80, 1.18 282 1.00 0.75, 1.34
UFP (particles/cm3)
 0 3702 166 1.09 0.96, 1.23 328 1.05 0.88, 1.24 285 1.26 1.07, 1.48
 0–2 3506 165 1.12 0.99, 1.27 322 0.99 0.83, 1.18 284 1.24 1.04, 1.48
 0–11 3265 165 1.11 0.94, 1.32 328 0.97 0.79, 1.21 287 1.04 0.81, 1.32
 0–23 2955 161 1.00 0.83, 1.21 327 0.96 0.77, 1.20 284 1.07 0.83, 1.38
 0–47 2568 156 1.06 0.86, 1.30 324 1.01 0.80, 1.28 283 1.14 0.87, 1.49
 0–71 2349 148 0.95 0.76, 1.18 321 0.94 0.73, 1.21 282 1.18 0.89, 1.56
UFP 11-50 nm (particle/cm3)
 0 2755 166 1.10 0.98, 1.24 328 1.04 0.87, 1.23 285 1.22 1.06, 1.41
 0–2 2551 165 1.12 1.00, 1.27 322 0.98 0.82, 1.17 284 1.22 1.04, 1.42
 0–11 2344 165 1.10 0.94, 1.31 328 0.93 0.75, 1.16 287 1.02 0.81, 1.29
 0–23 2151 161 1.01 0.83, 1.23 327 0.90 0.71, 1.14 284 1.01 0.78, 1.31
 0–47 1862 156 1.09 0.87, 1.35 324 0.98 0.76, 1.26 283 1.05 0.79, 1.39
 0–71 1682 148 0.95 0.75, 1.19 321 0.91 0.69, 1.20 282 1.13 0.84, 1.51
UFP 50-100 nm (particles/cm3)
 0 1161 166 1.03 0.92, 1.16 328 1.04 0.90, 1.21 285 1.14 0.95, 1.37
 0–2 1108 165 1.07 0.95, 1.21 322 1.01 0.86, 1.18 284 1.12 0.92, 1.35
 0–11 1118 165 1.09 0.92, 1.30 328 1.06 0.87, 1.29 287 1.04 0.84, 1.29
 0–23 1035 161 0.99 0.83, 1.19 327 1.06 0.87, 1.30 284 1.15 0.91, 1.45
 0–47 952 156 1.01 0.82, 1.25 324 1.07 0.85, 1.34 283 1.27 0.98, 1.64
 0–71 844 148 0.95 0.76, 1.17 321 0.98 0.78, 1.24 282 1.22 0.93, 1.59
BC (μg/m3)
 0 0.44 241 1.07 0.96, 1.20 353 1.06 0.93, 1.20 297 1.27 1.02, 1.59
 0–2 0.43 241 1.08 0.97, 1.21 347 1.07 0.94, 1.23 297 1.16 0.92, 1.47
 0–11 0.42 241 1.04 0.90, 1.19 352 1.05 0.90, 1.24 298 1.09 0.84, 1.42
 0–23 0.39 241 1.01 0.87, 1.17 353 1.05 0.89, 1.24 299 1.20 0.92, 1.56
 0–47 0.35 236 1.06 0.91, 1.24 349 1.08 0.90, 1.30 299 1.30 0.98, 1.73
 0–71 0.33 233 1.00 0.84, 1.18 348 0.98 0.80, 1.21 300 1.32 0.98, 1.78
SO2 (ppb)
 0 1.77 243 1.02 0.97, 1.08 353 1.02 0.91, 1.14 293 1.18 1.01, 1.36
 0–2 2.20 243 1.07 0.98, 1.17 348 1.06 0.90, 1.26 293 1.34 1.07, 1.69
 0–11 2.27 242 1.18 1.05, 1.33 351 1.04 0.84, 1.30 296 1.40 1.00, 1.98
 0–23 2.30 245 1.14 0.99, 1.32 354 0.98 0.73, 1.31 297 1.62 1.10, 2.38
 0–47 2.19 244 1.11 0.93, 1.32 346 1.08 0.77, 1.53 296 1.61 0.98, 2.65
 0–71 2.22 242 1.10 0.89, 1.36 344 1.37 0.92, 2.05 297 1.55 0.84, 2.83
O3 (ppb)
 0 18.0 245 0.88 0.70, 1.11 350 0.91 0.74, 1.13 289 0.88 0.68, 1.13
 0–2 17.3 244 0.86 0.68, 1.08 342 0.94 0.76, 1.16 286 0.91 0.70, 1.17
 0–11 15.2 243 0.87 0.69, 1.09 349 0.98 0.79, 1.21 296 0.91 0.71, 1.17
 0–23 13.7 247 0.91 0.70, 1.16 350 0.96 0.76, 1.20 296 0.89 0.68, 1.16
 0–47 12.9 247 0.75 0.57, 0.99 344 0.96 0.74, 1.25 296 0.90 0.67, 1.21
 0–71 12.3 246 0.78 0.59, 1.04 340 1.06 0.80, 1.40 297 0.86 0.63, 1.18
CO (ppm)
 0 0.23 242 1.09 0.94, 1.26 334 1.31 1.02, 1.68 290 1.29 0.85, 1.96
 0–2 0.23 242 1.09 0.94, 1.26 324 1.28 1.00, 1.65 286 1.11 0.69, 1.78
 0–11 0.21 241 1.05 0.88, 1.25 337 1.29 0.97, 1.70 295 1.05 0.64, 1.70
 0–23 0.22 243 0.99 0.81, 1.20 335 1.26 0.93, 1.71 297 1.20 0.70, 2.06
 0–47 0.21 242 1.03 0.84, 1.26 332 1.32 0.96, 1.82 296 1.14 0.62, 2.11
 0–71 0.21 242 1.00 0.81, 1.24 326 1.35 0.95, 1.93 296 1.13 0.56, 2.27
  1. Odds ratios were estimated from conditional logistic regression models adjusting for mean temperature and relative humidity during the same lag hour(s)
  2. IQR interquartile range, STEMI ST-elevation myocardial infarction, OR odds ratio, 95%CI 95% confidence interval