Table 1. Association between demographic variables and filarial antigen and antibodies.
| All participants | Og4C3>128 | Og4C3>32 | Wb123 | Bm14 | ||||||||||||||
| N | % | N | Prevalence | OR | p | N | Prevalence | OR | p | N | Prevalence | OR | p | N | Prevalence | OR | p | |
| Total samples | 807 | 805 | 805 | 806 | 806 | |||||||||||||
| Total positive | 6 | 0.7% | 26 | 3.2% | 65 | 8.1% | 144 | 17.9% | ||||||||||
| Gender | ||||||||||||||||||
| Females | 380 | 47.1% | 0 | 0.0% | - | - | 8 | 2.1% | 1 | 11 | 2.9% | 1 | 41 | 10.8% | 1 | |||
| Males | 423 | 52.4% | 6 | 1.4% | - | - | 18 | 4.3% | 2.1 | 0.1 | 54 | 12.8% | 4.90 | 0.00 | 103 | 24.3% | 2.7 | 0.00 |
| Age (years) | ||||||||||||||||||
| <20 | 106 | 13.3% | 0 | 0.0% | - | - | 1 | 0.9% | 1 | 3 | 2.8% | 1 | 5 | 4.7% | 1 | |||
| 20–29 | 147 | 18.4% | 2 | 1.4% | 1 | - | 7 | 4.8% | 5.3 | 0.12 | 12 | 8.2% | 3.1 | 0.09 | 11 | 7.5% | 1.6 | 0.38 |
| 30–39 | 142 | 17.8% | 2 | 1.4% | 1 | 0.98 | 7 | 4.9% | 5.4 | 0.12 | 13 | 9.2% | 3.5 | 0.06 | 31 | 21.8% | 5.6 | 0.00 |
| 40–49 | 160 | 20.0% | 1 | 0.6% | 0.5 | 0.52 | 3 | 1.9% | 2.0 | 0.55 | 16 | 10.0% | 3.8 | 0.04 | 33 | 20.6% | 5.2 | 0.00 |
| 50–59 | 119 | 14.9% | 0 | 0.0% | - | - | 5 | 4.2% | 4.6 | 0.17 | 10 | 8.4% | 3.1 | 0.09 | 30 | 25.2% | 6.8 | 0.00 |
| 60–69 | 89 | 11.1% | 1 | 1.1% | 0.8 | 0.87 | 1 | 1.1% | 1.2 | 0.90 | 8 | 9.0% | 3.4 | 0.08 | 24 | 27.0% | 7.5 | 0.00 |
| >70 | 36 | 4.5% | 0 | 0.0% | - | - | 1 | 2.8% | 3.0 | 0.44 | 3 | 8.3% | 3.1 | 0.18 | 9 | 25.0% | 6.7 | 0.00 |
| Years lived in AS | ||||||||||||||||||
| Whole life | 555 | 68.8% | 4 | 0.7% | 13 | 2.3% | 39 | 7.0% | 87 | 15.7% | ||||||||
| >10 years | 718 | 89.0% | 4 | 0.6% | 1 | 19 | 2.6% | 1 | 55 | 7.7% | 1 | 129 | 18.0% | 1 | ||||
| 5 to 10 years | 54 | 6.7% | 0 | 0.0% | - | - | 2 | 3.7% | 1.4 | 0.65 | 5 | 9.3% | 1.2 | 0.67 | 6 | 11.1% | 0.6 | 0.21 |
| <5 years | 28 | 3.5% | 2 | 7.1% | 13.7 | 0.003 | 4 | 14.3% | 6.2 | 0.002 | 5 | 17.9% | 2.6 | 0.06 | 8 | 28.6% | 1.8 | 0.16 |
| Occupational groups | ||||||||||||||||||
| Indoor | 192 | 23.8% | 0 | 0.0% | - | 3 | 1.6% | 1 | 9 | 4.7% | 1 | 26 | 13.5% | 1 | ||||
| Outdoor | 62 | 7.7% | 0 | 0.0% | - | 3 | 4.8% | 3.2 | 0.16 | 6 | 9.7% | 2.2 | 0.16 | 13 | 21.0% | 1.7 | 0.17 | |
| Tuna cannery workers | 73 | 9.0% | 2 | 2.7% | 3.3 | 0.17 | 4 | 5.5% | 3.6 | 0.10 | 11 | 15.1% | 3.6 | 0.01 | 16 | 21.9% | 1.8 | 0.10 |
| Others (mixed, unknown, unemployed) | 480 | 59.5% | 4 | 0.8% | 1 | 16 | 3.3% | 2.2 | 0.22 | 39 | 8.1% | 1.8 | 0.12 | 89 | 18.5% | 1.5 | 0.12 | |
| Household income (USD) | ||||||||||||||||||
| <$10,000 | 324 | 40.1% | 3 | 0.9% | 1 | 11 | 3.4% | 1 | 30 | 9.3% | 1 | 66 | 20.4% | 1 | ||||
| $10,000–$20,000 | 230 | 28.5% | 3 | 1.3% | 1.2 | 0.67 | 10 | 4.3% | 1.3 | 0.55 | 20 | 8.7% | 0.9 | 0.83 | 40 | 17.4% | 0.83 | 0.39 |
| $20,000–$30,000 | 61 | 7.6% | 0 | 0.0% | - | - | 0 | 0.0% | - | - | 3 | 4.9% | 0.5 | 0.28 | 12 | 19.7% | 0.96 | 0.90 |
| >$30,000 | 64 | 7.9% | 0 | 0.0% | - | - | 1 | 1.6% | 0.5 | 0.45 | 2 | 3.1% | 0.3 | 0.12 | 7 | 10.9% | 0.48 | 0.08 |
| Unknown | 128 | 15.9% | 0 | 0.0% | - | - | 4 | 3.1% | 0.9 | 0.89 | 10 | 7.8% | 0.8 | 0.63 | 19 | 14.8% | 0.68 | 0.18 |
| Chi2/Fisher * | Chi2/Fisher * | Chi2/Fisher * | Chi2/Fisher * | |||||||||||||||
| Island of residence | p | p | p | p | ||||||||||||||
| Tutuila | 721 | 89.3% | 6 | 0.7% | 1.00 | 26 | 3.2% | 0.10 | 57 | 7.1% | 0.65 | 127 | 15.8% | 0.62 | ||||
| Other islands | 86 | 10.7% | 0 | 0.0% | 1.00 | 0 | 0.0% | 0.10 | 8 | 1.0% | 0.65 | 17 | 2.1% | 0.62 | ||||
Statistically significant results (p<0.05) highlighted in bold. OR = odds ratios on univariate logistic regression.
*Chi-squared or Fisher exact tests were used to compare differences between islands. Logistic regression was not performed because no antigen-positive cases were detected on the smaller islands.