Table 3.
Weighted proportion of samples that were positive¶, equivocal and negative for measles antibody by age group, sex, region and whether born in Canada.
| Variable | % Positive (95% CI) | % Equivocal (95% CI) | % Negative (95% CI) | P values*** |
|---|---|---|---|---|
| Age group (years) | ||||
| 3–5 | 92.4 (89.4, 95.4) | 1.6 (0.5, 2.7)* | 6.0 (3.2, 8.8)* | <0.0001 |
| 6–11 | 84.6 (80.2, 88.9) | 7.2 (5.1, 9.3) | 8.2 (5.2, 11.2)* | |
| 12–19 | 78.7 (74.2, 83.2) | 11.5 (8.7, 14.3) | 9.7 (6.3, 13.2)* | |
| 20–39 | 83.7 (80.2, 87.2) | 7.3 (4.8, 9.8) | 9.0 (6.6, 11.4) | |
| 40–59 | 94.8 (92.8, 96.8) | 1.8 (0.9, 2.7)* | 3.4 (2.0, 4.7)* | |
| 60–79 | 99.6 (99.3, 99.9) | 0.2 (0.0, 0.4)** | 0.2 (0.0, 0.5)** | |
| Sex | ||||
| Male | 88.3 (85.8, 90.7) | 4.9 (3.5, 6.3) | 6.8 (5.2, 8.4) | <0.001 |
| Female | 91.9 (90.1, 93.6) | 4.0 (2.9, 5.1) | 4.2 (2.9, 5.4) | |
| Region | ||||
| Ontario | 90.6 (88.2, 93.0) | 4.0 (2.3, 5.7)* | 5.4 (3.9, 6.9) | 0.24 |
| Quebec | 92.1 (88.6, 95.6) | 4.1 (2.2, 6.1)* | 3.8 (1.9, 5.6)* | |
| Others | 88.2 (84.5, 91.9) | 5.1 (3.3, 6.9)* | 6.7 (4.0, 9.4)* | |
| Born in Canada | ||||
| No | 92.9 (90.6, 95.3) | 3.4 (1.7, 5.1)* | 3.7 (1.8, 5.7)* | 0.01 |
| Yes | 89.0 (86.9, 91.1) | 4.9 (3.6, 6.1) | 6.1 (4.9, 7.4) | |
| Total | 90.0 (88.2, 91.9) | 4.5 (3.4, 5.5) | 5.5 (4.3, 6.7) | |
*
Interpret with caution due to high sampling variability, coefficient of variation (CV) > 16.6% and ≤ 33.3%.
**
Interpret with caution due to extreme sampling variability, CV > 33.3%.
***
Chi2 p-value is assessing statistically significant differences between the proportion of immune (positive samples) and non-immune (negative and equivocal samples) samples.
¶
Final immunity status: All samples were tested in BioPlex. Negative and equivocal samples were re-tested in PRNT.