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Table 2 Univariate analysis of demographic and socioeconomic risk factors affecting antigen and antibody positivity

From: Demographic, socioeconomic and disease knowledge factors, but not population mobility, associated with lymphatic filariasis infection in adult workers in American Samoa in 2014

FactorLevelAgBm14 AbWb123 AbAny Ab
% positive (n)OR (95% CI)% positive (n)OR (95% CI)% positive (n)OR (95% CI)% positive (n)OR (95% CI)
Sampling siteCannery1.61 (498) 12.47 (497) 12.68 (497) 18.31 (497) 
Clinic2.33 (172)1.46 (0.43–4.90)10.06 (169)0.78 (0.44–1.38)7.10 (169)0.53 (0.28–1.00)**14.20 (169)0.74 (0.45–1.20)
Age(per year) 1.01 (0.96–1.06) 1.03(1.00–1.05)*** 1.01 (0.99–1.03) 1.01 (1.00–1.03)*
Age group (years)15–241.14 (88)Ref6.98 (86)Ref11.63 (86)Ref16.28 (86)Ref
25–341.63 (123)1.44 (0.13–16.11)4.92 (122)0.69 (0.21–2.22)5.74 (122)0.46 (0.17–1.27)*8.20 (122)0.46 (0.19–1.09)**
35–442.54 (197)2.27 (0.26–19.68)16.75 (197)2.68 (1.08–6.67)***13.71 (197)1.21 (0.56–2.62)22.34 (197)1.48 (0.76–2.87)
45–541.94 (206)1.72 (0.19–15.64)12.68 (205)1.94 (0.77–4.89)*13.66 (205)1.20 (0.56–2.60)18.05 (205)1.13 (0.58–2.22)
> 550 (56)na14.29 (56)2.22 (0.73–6.79)*5.36 (56)0.43 (0.11–1.64)17.86 (56)1.11 (0.46–2.73)
GenderFemale1.26 (398) 7.09 (395) 6.84 (395) 10.89 (395) 
Male2.83 (247)2.30 (0.72–7.30)*18.62 (247)3.00 (1.82–4.95)****17.81 (247)2.95 (1.78–4.91)****26.72 (247)2.98 (1.95–4.56)****
EthnicityNon-Samoan0 (16)#12.50 (16) 12.50 (16) 25.0 (16) 
Samoan1.90 (630)na11.80 (627)0.94 (0.21–4.20)11.32 (627)0.89 (0.20–4.01)17.07 (627)0.62 (0.19–1.95)
SES quantilePer decr. quantile 2.18 (0.90–5.01)** 1.28 (0.94–1.76)* 1.43 (1.03–1.99)*** 1.44 (1.09–1.89)***
SES quantile (by group)Low2.59 (232)##14.29 (231)1.63 (0.86–3.12)13.85 (231)2.21 (1.08–4.52)***21.65 (231)2.08 (1.17–3.68)***
Medium2.38 (252)na11.20 (250)1.24 (0.64–2.40)11.60 (250)1.80 (0.87–3.72)*16.4 (250)1.48 (0.82–2.65)*
High0 (162) 9.26 (162)Ref6.79 (162)Ref11.73 (162)Ref
Persons per housePer person 0.93 (0.75–1.15) 1.03 (0.96–1.11) 0.97 (0.89–1.05) 1.04 (0.98–1.11)
EducationSnr 2ndary or higher2.07 (580)#10.92 (577) 10.75 (577) 16.46 (577) 
< Snr 2ndary0 (64)na17.19 (64)1.69 (0.84–3.41)*12.50 (64)1.19 (0.54–2.60)20.31 (64)1.29 (0.68–2.47)
Work locationIndoor1.69 (534)#11.63 (533) 11.07 (533) 16.7 (533) 
Outdoor or mixed0 (38)na18.42 (38)1.72 (0.72–4.06)18.42 (38)1.81 (0.76–4.30)*26.32 (38)1.78 (0.84–3.80)*
  1. # not significant (Fisher’s exact test), ## P < 0.04 by Fisher’s exact test comparing High vs Med+Low SES
  2. *P < 0.2, **P < 0.1, ***P < 0.05, ****P < 0.01
  3. Abbreviations: Ag: antigen (ICT and/or Og4C3); n, no .positive; N, no. tested; na, not available (zero cases); Snr 2ndary, senior secondary; per decr, per decreasing; Ref, reference category