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Nomogram of the predictive model for PCP. When using a nomogram, locate the position of each variable on the corresponding horizontal axis and draw a vertical line to the top score axis to determine the score for that variable. Then sum the scores of all variables and draw a line from the total score to the probability axis at the bottom of the nomogram to determine the predicted risk of ARF. Youth: age < 40 years; Middle-age: age 40–59 years; Old-age: age ≥ 60 years.
