TABLE 1.

Rates of Outpatient Visits for Influenza and Other Respiratory Illnesses Among Healthy and High-Risk Children During Defined Seasonal Periods

Risk Group, Seasonal Period, and Age GroupNo. of Outpatient VisitsNo. of Person-MonthsRate/100 Person-Months (95% CI)Race-Adjusted Rate/100 Person-Months (95% CI)
Healthy children
Influenza period
 6–23 mo196113 51714.5 (13.9 to 15.1)16.2 (15.6 to 16.9)
 2–4 y305329 74410.2 (9.9 to 10.6)
 5–17 y7782116 0676.7 (6.6 to 6.9)
RSV period
 6–23 mo296917 19117.3 (16.7 to 17.8)18.7 (18.0 to 19.3)
 2–4 y397837 45710.6 (10.3 to 10.9)
 5–17 y9137148 3266.2 (6.0 to 6.3)
Periseasonal baseline period
 6–23 mo593446 52612.8 (12.5 to 13.1)14.1 (13.7 to 14.4)
 2–4 y8829102 0178.7 (8.5 to 8.8)
 5–17 y21 749394 8215.5 (5.4 to 5.6)
Summer baseline period
 6–23 mo213638 1145.6 (5.4 to 5.8)6.3 (6.0 to 6.5)
 2–4 y371183 5094.4 (4.3 to 4.6)
 5–17 y10 578338 4283.1 (3.1 to 3.2)
High-risk children
Influenza period
 6–23 mo515179328.7 (26.6 to 30.9)35.6 (33.30 to 38.0)
 2–4 y922353126.1 (24.7 to 27.6)
 5–17 y26921402119.2 (18.6 to 19.9)
RSV period
 6–23 mo743226832.8 (30.8 to 34.7)38.4 (36.2 to 40.5)
 2–4 y1434454731.5 (30.2 to 32.9)
 5–17 y321417 97417.9 (17.3 to 18.5)
Periseasonal baseline period
 6–23 mo1627622926.1 (25.0 to 27.2)30.1 (28.9 to 31.3)
 2–4 y364212 13030.0 (29.2 to 30.9)
 5–17 y915547 46519.2 (18.8 to 19.5)
Summer baseline period
 6–23 mo648514512.6 (11.7 to 13.5)13.1 (6.5 to 5.1)
 2–4 y143810 24814.0 (13.4 to 14.7)
 5–17 y473141 46211.4 (11.1 to 11.7)