Table 2.
Concordance between rectal swab and bulk stool specimens for detection of norovirus, Santa Rosa, Guatemala, 2009.
| Concordant specimens |
Discordant specimens |
P–valuea | |||||
|---|---|---|---|---|---|---|---|
| Swab+/bulk+ | Swab−/bulk− | Total concordance (95% CI) |
Swab+/bulk− | Swab−/Bulk+ | Total discordance (95% CI) |
||
| Characteristic | |||||||
| Overall (n = 100) | 8 | 78 | 86% (79–93%) | 8 | 6 | 14% (7–21%) | 0.6 |
| Age group | |||||||
| <1 year (n = 41) | 5 | 28 | 80% (68–93%) | 5 | 3 | 20% (7–32%) | 0.5 |
| 1 to <2 years (n = 39) | 3 | 31 | 87% (77–98%) | 3 | 2 | 13% (2–23%) | 0.7 |
| 2 to <5 years (n = 20) | 0 | 19 | 95% (85–100%) | 0 | 1 | 5% (0–15%) | 0.5 |
| Healthcare setting | |||||||
| Ambulatory (n = 37) | 1 | 31 | 86% (75–98%) | 4 | 1 | 14% (3–25%) | 0.2 |
| Hospital (n = 63) | 7 | 47 | 86% (77–94%) | 4 | 5 | 14% (6–23%) | 0.7 |
| Clinical characteristic | |||||||
| Onset <1.5 days (n = 50) | 3 | 38 | 82% (71–93%) | 5 | 4 | 18% (7–29%) | 0.8 |
| Current diarrhea (n = 89) | 7 | 68 | 84% (77–92%) | 8 | 6 | 16% (8–23%) | 0.6 |
| Vomiting (n = 76) | 8 | 59 | 88% (81–95%) | 4 | 5 | 12% (5–19%) | 0.8 |
| <1 year old with vomiting (n = 31) | 5 | 22 | 87% (75–99%) | 2 | 2 | 13% (1–25%) | 1.0 |
CI = confidence interval; NA = not applicable.
a
Based on McNemar test for difference between paired proportions (specimen types).