† Model 1 included the following symptom measures: significant runny nose day 1, significant runny nose day 4, significant cough day 4, and any fever day 3. ‡ Model 2 included the following symptom measures: significant runny nose days 1-4, significant cough days 1-4, and any fever days 1-4. § Model 3 included the following symptom measures: significant runny nose days 1-4 and significant cough days 1-4. Model 4 is based on the sum of the severity (rated 0 -3) for the following symptoms for 6 days: sneezing, headache, chilliness, malaise, runny nose, nasal congestion, cough, and sore throat (Jackson score) 8. of any or all the fever symptom measures tended to decrease the precision of the prediction rule. Model 3, which included the symptom measures of significant runny nose on days 1-4 and significant cough on days 1-4, was the most accurate model for differentiating children with a viral URI from those with no URI and was chosen as the final URI symptom score. Model 4 was based on the Jackson score. However, because many parents responded "can't tell" for severity of certain symptoms, the score was calculated on only 65 children.