TABLE 2.
—Risk Factors for Rubella Susceptibility Among Poultry-Processing Plant Workers: Alabama, June 2000a
| Susceptibility Status | Univariate Risk Factor Analysis | |||
| Immune (n = 281) No. (%) | Susceptible (n = 48) No. (%) | Prevalence Ratio (95% Confidence Interval) | P | |
| Age, y | ||||
| ≤ 20 | 44 (83) | 9 (17) | 1.33 (0.63, 2.81) | .463 |
| 21–30 | 123 (84) | 23 (16) | 1.23 (0.68, 2.22) | .490 |
| > 30 | 109 (87) | 16 (13) | Referent | |
| Sex | ||||
| Male | 152 (84) | 29 (16) | 1.25 (0.73, 2.13) | .416 |
| Female | 129 (87) | 19 (13) | Referent | |
| Country of birth | ||||
| US | 115 (90) | 13 (10) | Referent | |
| Mexico | 129 (80) | 32 (20) | 1.96 (1.07, 3.57) | .024* |
| Guatemala | 37 (93) | 3 (8) | 0.74 (0.22, 2.46) | .442 |
| Length of stay in the US,b mo Median (range) | 8 (<1–84) | 6 (<1–36) | . . . | .174 |
| Length of employment, mo Median (range) | 3 (<1–130) | 2 (<1–25) | . . . | .071 |
aPersons with equivocal rubella immunoglobulin G results not included (n = 8). Denominators may change because of missing data (age not available for 5 persons, length of stay in the United States not available for 4, and length of employment not available for 12).
bLength of stay in the United States is only for non-US-born persons.
*Significant at P < .05.