Table 2.
Univariate analysis of demographic and socioeconomic risk factors affecting antigen and antibody positivity
| Factor | Level | Ag | Bm14 Ab | Wb123 Ab | Any Ab | ||||
|---|---|---|---|---|---|---|---|---|---|
| % positive (n) | OR (95% CI) | % positive (n) | OR (95% CI) | % positive (n) | OR (95% CI) | % positive (n) | OR (95% CI) | ||
| Sampling site | Cannery | 1.61 (498) | 12.47 (497) | 12.68 (497) | 18.31 (497) | ||||
| Clinic | 2.33 (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) | 15–24 | 1.14 (88) | Ref | 6.98 (86) | Ref | 11.63 (86) | Ref | 16.28 (86) | Ref |
| 25–34 | 1.63 (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)** | |
| 35–44 | 2.54 (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) | |
| 45–54 | 1.94 (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) | |
| > 55 | 0 (56) | na | 14.29 (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) | |
| Gender | Female | 1.26 (398) | 7.09 (395) | 6.84 (395) | 10.89 (395) | ||||
| Male | 2.83 (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)**** | |
| Ethnicity | Non-Samoan | 0 (16) | # | 12.50 (16) | 12.50 (16) | 25.0 (16) | |||
| Samoan | 1.90 (630) | na | 11.80 (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 quantile | Per 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) | Low | 2.59 (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)*** |
| Medium | 2.38 (252) | na | 11.20 (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)* | |
| High | 0 (162) | 9.26 (162) | Ref | 6.79 (162) | Ref | 11.73 (162) | Ref | ||
| Persons per house | Per 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) | ||||
| Education | Snr 2ndary or higher | 2.07 (580) | # | 10.92 (577) | 10.75 (577) | 16.46 (577) | |||
| < Snr 2ndary | 0 (64) | na | 17.19 (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 location | Indoor | 1.69 (534) | # | 11.63 (533) | 11.07 (533) | 16.7 (533) | |||
| Outdoor or mixed | 0 (38) | na | 18.42 (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)* | |
# not significant (Fisher’s exact test), ## P < 0.04 by Fisher’s exact test comparing High vs Med+Low SES
*P < 0.2, **P < 0.1, ***P < 0.05, ****P < 0.01
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