TABLE 2.
Relation of F+ Coliphage in Sand with GI Illness and Diarrhea by Status of Sand Contact and by Categorical Classification.
| GI Illness
|
Diarrhea
|
|||
|---|---|---|---|---|
| No. (%)a | aOR (95% CI)b | No. (%)a | aOR (95% CI)b | |
| Digging In Sand | (n= 3835) | (n = 3864) | ||
| Not digging d | 142 (5) | 1.00 | 86 (3) | 1.00 |
| Digging | ||||
| F+ coliphage | ||||
| absent | 57 (9) | 1.57 (1.04–2.39) | 38 (6) | 1.81 (1.12–2.93) |
| present | 26 (8) | 1.19 (0.69–2.06) | 19 (6) | 1.43 (0.75–2.71) |
| Test for trende | P=0.17 | P=0.07 | ||
| ≤median (0.014 MPN/gf) | 72 (9) | 1.51 (1.04–2.20) | 48 (6) | 1.72 (1.12–2.65) |
| > median | 11 (8) | 1.03 (0.43–2.50) | 9 (7) | 1.43 (0.55–3.73) |
| Test for trende | P=0.17 | P=0.05 | ||
| Buried In Sand | (n = 3838) | (n = 3867) | ||
| Not buried d | 208 (6) | 1.00 | 130 (4) | 1.00 |
| Buried | ||||
| F+ coliphage | ||||
| absent | 9 (8) | 1.39 (0.63–3.09) | 6 (6) | 1.51 (0.56–4.05) |
| present | 8 (16) | 2.29 (0.74–7.07) | 7 (14) | 3.32 (0.94–11.7) |
| Test for trende | 0.11 | 0.05 | ||
| ≤median (0.014 MPN/gf) | 14 (10) | 1.52 (0.76–3.05) | 10 (6) | 1.78 (0.74–4.29) |
| > median (0.014 MPN/gf) | 3 (30) | 4.20 (0.34, 51.1) | 3 (30) | 6.99 (0.60–81.3) |
| Test for trende | P=0.12 | P=0.06 | ||
a
The numbers are participants reporting new symptoms, among those without baseline symptoms.
b
Robust variance estimates clustering on household.
c
The numbers are participants with complete information on age, sex, race/ethnicity, beach, and any contact swimming, among those without baseline symptoms.
d
Reference category.
e
P value from a linear trend test across the non-sand-exposed to the highest sand-exposed category.
f
MPN/g indicates most probable number per gram of dry weight sand.
aOR estimated from logistic regression model adjusted for age, sex, race/ethnicity, beach, and any contact swimming.