Table 3 Odds ratios from multivariate logistic regression models for pH1N1 illness acquisition and ethnicity under various sensitivity analyses

Restricted to those with symptoms and those tested for reasons other than travel to Mexico (primary analysis)

ref

ref

2.59 (1.02-6.57)

1.96 (0.82-4.66)

6.22 (2.01-19.24)

1.88 (0.80-4.41)

9.72 (2.29-41.27)

6.44 (1.83-22.59)

2.00 (0.74-5.42)

2.06 (0.83-5.11)

Individuals tested because of travel to Mexico added

ref

ref

2.99 (1.20-7.45)

2.01 (0.85-4.73)

7.34 (2.42-22.28)

1.84 (0.80-4.24)

10.93 (2.61-45.73)

6.45 (1.86-22.44)

2.24 (0.88-5.70)

1.70 (0.73-3.97)

Those not presenting with symptoms are included

ref

ref

2.57 (1.06-6.23)

1.92 (0.84-4.38)

6.03 (2.21-16.44)

1.83 (0.81-4.14)

10.34 (2.58-41.46)

5.44 (1.72-17.24)

1.67 (0.70-3.99)

2.28 (0.95-5.45)

No restrictions

ref

ref

2.96 (1.24-7.05)

1.99 (0.88-4.50)

7.42 (2.79-19.74)

1.82 (0.82-4.06)

11.28 (2.85-44.60)

5.62 (1.78-17.71)

1.79 (0.78-4.08)

1.80 (0.81-4.01)

Heart disease and diabetes added independently of other underlying medical conditions

ref

2.56 (0.99-6.64)

6.55 (1.99-21.57)

10.19 (2.35-44.22)

1.34 (0.46-3.90)

Without risk factors

ref

ref

2.63 (0.91-7.59)

2.48 (0.92-6.64)

10.34 (2.39-44.80)

2.92 (1.11-7.68)

11.90 (2.30-61.65)

16.02 (2.85-89.92)

1.69 (0.54-5.30)

3.09 (1.06-9.00)

Tested prior to June 11th, 2009

ref

ref

2.66 (1.01-7.02)

2.90 (1.10-7.64)

6.97 (2.07-23.50)

1.82 (0.68-4.87)

8.18 (1.85-36.22)

7.21 (1.72-30.21)

2.05 (0.70-6.05)

2.34 (0.82-6.71)