Greater ERLP occurrence was observed in runners with less than 3 years experience (RR = 1.53; 1.08-2.17 95% CI) and runners who ran fewer than 15 miles/ week (RR = 1.47; 1.04-2.08 95% CI). Those runners with < 3 years running experience and a race pace of 9 min/mile or > were at greater risk for ERLP when compared to other participants (RR=1.53; 1.07-2.18 95% CI)