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Table 1 Prevalence and Predicted Probabilities * of Nonsinus Tachycardia (NST) Based on Age and Heart Rate (HR)

From: Sinus versus nonsinus tachycardia in the emergency department: Importance of age and heart rate

Age (years) Heart Rate (beats/min)
  100–120 (0 Points) 121–140 (3 Points) ≥141 (8 Points)
<50 (0 Points) 0 Points 3 Points 8 Points
Predicted Probability of NST 3% 13% 62%
Observed Probability of NST 1% (1/77) 13% (4/30) 67%(6/9)
51–70 (3 Points) 3 Points 6 Points 11 Points
Predicted Probability of NST 13% 39% 86%
Observed Probability of NST 12%(14/114) 40%(8/20)) 75%(15/20)
>71 (5 Points) 5 Points 8 Points 13 Points
Predicted Probability of NST 28% 62% 93%
Observed Probability of NST 30%(50/165) 59%(20/41) 88(21/24)
  1. *Probability of NST is given by the equation: ln(p/1-p) = [-3.536 + (1.099 × score) - (0.0235 × score2)]