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Table 3 Number of acupuncture treatments and risk of acute myocardial infarction in stroke patients

From: Decreased risk of acute myocardial infarction in stroke patients receiving acupuncture treatment: a nationwide matched retrospective cohort study

Acupuncture treatment Number Events Person-years Incidenceb HR (95 % CI)a
Numbers of packages       
 0 46950 2978 265756 11.2 1.00 (reference)
 ≥1 23475 1054 106663 9.9 0.86 (0.80–0.93)
 ≥2 16789 733 81701 9.0 0.79 (0.73–0.86)
 ≥3 13236 550 66789 8.2 0.73 (0.67–0.80)
 ≥4 10946 449 56537 7.9 0.71 (0.64–0.78)
 ≥5 9361 374 49103 7.6 0.68 (0.61–0.76)
 ≥6 8117 330 43027 7.7 0.69 (0.62–0.77)
 ≥7 7150 276 38333 7.2 0.65 (0.58–0.74)
 ≥8 6341 249 34381 7.2 0.66 (0.58–0.75)
 ≥9 5715 220 31218 7.0 0.64 (0.56–0.74)
 ≥10 5147 199 28312 7.0 0.64 (0.56–0.74)
 ≥11 4731 184 26153 7.0 0.64 (0.55–0.74)
 ≥12 4335 169 24206 7.0 0.64 (0.55–0.75)
 ≥13 3994 151 22417 6.7 0.62 (0.52–0.73)
 ≥14 3706 143 20854 6.9 0.63 (0.53–0.77)
 ≥15 3455 130 19545 6.7 0.61 (0.51–0.73)
  1. CI confidence interval, HR hazard ratio
  2. aAdjusted for age, sex, low income, subtypes of stroke, hypertension, diabetes, mental disorders, hyperlipidemia, cardiac arrhythmia, traumatic brain injury, Parkinson’s disease, depression, Alzheimer’s disease, obesity, malignant brain tumors, smoking cessation, rehabilitation, anticoagulant, anti-platelet agents, lipid-lowering agents, admission to intensive care unit, neurosurgery, and lengths of hospital stay. P value (Cochran-Armitage test) <0.0001
  3. bPer 1000 person-years