Table 2 Number of infections during childhood in those who later developed JIA and in controls from the general population

 Upper respiratory tract infection (mean; SD)

3.7 (2.2)

3.9 (2.2)

OR 0.9 (0.6–1.2)

.382

 Gastroenteritis

0.5 (0.8)

0.6 (0.8)

OR 1.5 (0.6–3.6)

.345

 Influenza

0.2 (0.6)

0.3 (0.7)

OR 1.0 (1.0–1.0)

.995

 Common cold

5.3 (2.3)

5.5 (2.3)

OR 1.0 (0.8–1.4)

.810

 Tonsillitis

0.3 (0.8)

0.3 (0.6)

OR 1.0 (1.0–1.0)

.994

 Otitis

1.3 (1.8)

1.6 (1.9)

OR 1.3 (0.8–1.9)

.261

 Pneumonia

0.1 (0.4)

0.2 (0.5)

OR 1.3 (0.3–6.0)

.764

 Meningitis

0.0 (0.1)

0.0 (0.0)

OR 1.0 (1.0–1.0)

.999

 Gastroenteritis

1.4 (1.3)

1.2 (1.0)

OR 0.5 (0.2–1.1)

.074

 Three-day fever

0.6 (1.0)

0.6 (0.7)

OR 0.9 (0.4–1.9)

.845

 Influenza

0.8 (1.2)

0.4 (0.8)

OR 0.6 (0.2–1.6)

.297

 Common cold

5.7 (2.3)

5.8 (2.1)

OR 1.0 (0.7–1.3)

.894

 Tonsillitis

0.5 (1.1)

0.8 (1.5)

OR 0.9 (0.4–1.9)

.837

 Otitis

1.2 (1.7)

1.3 (2.0)

OR 0.7 (0.4–1.4)

.331

 Pneumonia

0.1 (0.3)

0.1 (0.4)

OR 2.2 (0.5–10.4)

.323

 Meningitis

0.0 (0.2)

0.0 (0.0)

OR 1.0 (1.0–1.0)

.999

 Gastroenteritis (viral)

2.1 (1.5)

2.4 (1.8)

OR 1.1 (0.7–1.7)

.556

 Gastroenteritis (bacterial)

0.1 (0.4)

0.1 (0.3)

OR 1.0 (1.0–1.0)

.997

 Pneumonia

0.1 (0.4)

0.1 (0.5)

OR 1.3 (0.3–6.5)

.748

 Three-day fever

0.5 (1.0)

0.6 (1.4)

OR 1.1 (0.5–2.9)

.774

 Influenza

0.9 (1.3)

1.3 (1.5)

OR 1.1 (0.6–2.2)

.693

 Common cold

4.0 (2.1)

4.6 (2.3)

OR 1.2 (0.9–1.7)

.252

 Tonsillitis

0.3 (0.8)

0.5 (0.9)

OR 1.1 (0.4–2.6)

.899

 Otitis

0.5 (1.1)

0.7 (1.4)

OR 1.0 (1.0–1.0)

.992

 Meningitis

0.0 (0.2)

0.0 (0.0)

OR 1.0 (1.0–1.0)

.999

 Gastroenteritis

1.4 (1.3)

1.7 (1.2)

OR 1.5 (0.8–2.5)

.181

 Influenza

0.7 (1.0)

0.9 (1.1)

OR 1.0 (0.5–2.0)

.937