Table 3 Univariate analysis of residence and mobility/travel risk factors affecting antigen and antibody positivity

Years lived in AS

< 9

2.91 (103)

Ref

8.74 (103)

Ref

12.62 (103)

Ref

15.53 (103)

Ref

9–14

2.25 (89)

0.77 (0.13–4.69)

19.10 (89)

2.47 (1.04–5.85)***

17.98 (89)

1.52 (0.69–3.36)

25.84 (89)

1.89 (0.93–3.87)**

> 14

1.54 (456)

0.52 (0.13–2.04)

10.82 (453)

1.27 (0.60–2.67)

9.49 (453)

0.73 (0.37–1.41)

15.67 (453)

1.01 (0.56–1.82)

Ever been outside AS

No

2.78 (72)

6.94 (72)

9.72 (72)

11.11 (72)

Yes

1.72 (577)

0.62 (0.13–2.87)

12.37 (574)

1.89 (0.74–4.85)*

11.50 (574)

1.21 (0.53–2.74)

17.94 (574)

1.75 (0.81–3.76)*

Travel to Samoa^a

No

1.86 (431)

12.12 (429)

11.66 (429)

17.72 (429)

Yes

1.83 (218)

0.99 (0.29–3.32)

11.06 (217)

0.90 (0.54–1.51)

10.60 (217)

0.90 (0.53–1.52)

16.13 (217)

0.89 (0.58–1.38)

Visitor from Samoa^a

No

1.83 (383)

12.34 (381)

11.55 (381)

17.59 (381)

Yes

1.90 (263)

1.04 (0.33–3.32)

11.07 (262)

0.88 (0.54–1.45)

11.07 (262)

0.95 (0.58–1.57)

16.79 (262)

0.95 (0.62–1.44)

Travel to endemic area^a

No

1.90 (421)

12.41 (419)

11.69 (419)

17.90 (419)

Yes

1.76 (227)

0.93 (0.28–3.11)

10.62 (226)

0.84 (0.50–1.40)

10.18 (226)

0.86 (0.51–1.45)

15.49 (226)

0.84 (0.54–1.30)

Travel to non-endemic area^a

No

2.05 (584)

#

12.18 (583)

11.66 (583)

17.50 (583)

Yes

0.00 (64)

na

8.06 (62)

0.63 (0.25–1.63)

6.45 (62)

0.52 (0.18–1.48)

12.90 (62)

0.70 (0.32–1.51)