Comparison of current (2004–2005) and previous (1985) results for each of the four sites included in both surveys
| . | . | 15/17-kDa . | 27-kDa . | ||||
|---|---|---|---|---|---|---|---|
| Site . | N . | GM ratiob . | 95% CI . | p-value . | GM ratiob . | 95% CI . | p-value . |
| Censored normal regressiona . | |||||||
| All sites | 399 | 0.94 | 0.64–1.37 | 0.741 | 1.52 | 1.22–1.91 | <0.001 |
| A (SW) | 99 | 0.75 | 0.42–1.35 | 0.339 | 1.80 | 1.19–2.73 | 0.006 |
| B (SW) | 100 | 0.68 | 0.36–1.31 | 0.249 | 1.43 | 1.04–1.98 | 0.029 |
| C (GW) | 100 | 1.01 | 0.45–2.28 | 0.978 | 1.46 | 0.99–2.15 | 0.055 |
| D (BF) | 100 | 1.61 | 0.56–4.65 | 0.377 | 1.39 | 0.72–2.69 | 0.318 |
| Site . | N . | Prevalence ratiob . | 95% CI . | p-value . | Prevalence ratiob . | 95% CI . | p-value . |
| Poisson regressionc . | |||||||
| All sites | 399 | 0.97 | 0.85–1.10 | 0.646 | 1.20 | 1.09–1.32 | <0.001 |
| A (SW) | 99 | 0.97 | 0.80–1.19 | 0.804 | 1.36 | 1.11–1.67 | 0.003 |
| B (SW) | 100 | 0.90 | 0.75–1.08 | 0.255 | 1.05 | 0.94–1.17 | 0.402 |
| C (GW) | 100 | 0.83 | 0.63–1.08 | 0.165 | 1.19 | 1.00–1.41 | 0.049 |
| D (BF) | 100 | 1.38 | 0.86–2.23 | 0.184 | 1.25 | 0.93–1.67 | 0.136 |
| . | . | 15/17-kDa . | 27-kDa . | ||||
|---|---|---|---|---|---|---|---|
| Site . | N . | GM ratiob . | 95% CI . | p-value . | GM ratiob . | 95% CI . | p-value . |
| Censored normal regressiona . | |||||||
| All sites | 399 | 0.94 | 0.64–1.37 | 0.741 | 1.52 | 1.22–1.91 | <0.001 |
| A (SW) | 99 | 0.75 | 0.42–1.35 | 0.339 | 1.80 | 1.19–2.73 | 0.006 |
| B (SW) | 100 | 0.68 | 0.36–1.31 | 0.249 | 1.43 | 1.04–1.98 | 0.029 |
| C (GW) | 100 | 1.01 | 0.45–2.28 | 0.978 | 1.46 | 0.99–2.15 | 0.055 |
| D (BF) | 100 | 1.61 | 0.56–4.65 | 0.377 | 1.39 | 0.72–2.69 | 0.318 |
| Site . | N . | Prevalence ratiob . | 95% CI . | p-value . | Prevalence ratiob . | 95% CI . | p-value . |
| Poisson regressionc . | |||||||
| All sites | 399 | 0.97 | 0.85–1.10 | 0.646 | 1.20 | 1.09–1.32 | <0.001 |
| A (SW) | 99 | 0.97 | 0.80–1.19 | 0.804 | 1.36 | 1.11–1.67 | 0.003 |
| B (SW) | 100 | 0.90 | 0.75–1.08 | 0.255 | 1.05 | 0.94–1.17 | 0.402 |
| C (GW) | 100 | 0.83 | 0.63–1.08 | 0.165 | 1.19 | 1.00–1.41 | 0.049 |
| D (BF) | 100 | 1.38 | 0.86–2.23 | 0.184 | 1.25 | 0.93–1.67 | 0.136 |
PC, positive control; SW, surface water; GW, groundwater; BF, river-bank infiltration; 95% CI, 95% confidence interval; GM ratio, geometric means ratio.
aDifferences in geometric means of measured response.
bResults from the 2004–2005 survey relative to the 1985 survey, adjusted for age group and gender.
cDifferences in a prevalence of persons with a strong response (≥20% of PC).