Table 3.
Unadjusted and adjusted prevalence ratios* for acute gastrointestinal illness (AGI) in persons in counties affected by water service interruptions, Alabama, 2010 (N = 1283)
| Persons with AGI, N (%)* | Unadjusted*† | Adjusted*†‡ | |||
|---|---|---|---|---|---|
| PR | 95% CI | PR | 95% CI | ||
| Sampling area | |||||
| Area under boil water advisory | 77 (8·2) | 1·2 | 0·7–2·1 | 1·2 | 0·6–2·2 |
| Area not under boil water advisory | 31 (6·9) | 1·0 | 1·0 | ||
| Household water service interruption | |||||
| No loss of service or pressure | 13 (4·3) | 1·0 | 1·0 | ||
| Yes, low pressure and/or loss of service | 95 (9·3) | 2·3 | 1·0–5·2 | 2·0 | 0·9–4·8 |
| Loss of service and loss of pressure | 67 (12·4) | 3·2 | 1·4–7·4 | 2·7 | 1·1–6·8 |
| Loss of service only | 10 (6·1) | 1·5 | 0·5–4·1 | 1·2 | 0·4–3·4 |
| Loss of pressure only | 18 (6·6) | 1·6 | 0·6–4·1 | 1·7 | 0·6–4·4 |
| Loss of service | |||||
| None | 31 (5·2) | 1·0 | 1·0 | ||
| <7 days | 31 (8·8) | 1·8 | 0·9–3·4 | 1·4 | 0·7–2·7 |
| ≥7 days | 46 (13·2) | 2·8 | 1·5–5·4 | 2·4 | 1·1–5·2 |
| Ptrend | 0·001 | 0·03 | |||
| Loss of pressure | |||||
| None | 23 (4·7) | 1·0 | 1·0 | ||
| 1–2 days | 32 (7·1) | 1·6 | 0·7–3·2 | 1·5 | 0·7–3·2 |
| 3–6 days | 30 (12·7) | 2·9 | 1·4–6·2 | 3·0 | 1·4–6·4 |
| ≥7 days | 23 (15·6) | 3·8 | 1·6–8·7 | 3·6 | 1·4–9·0 |
| Ptrend | 0·0002 | 0·002 | |||
| Tap water access and use | |||||
| Unaffected household | 13 (4·3) | 1·0 | 1·0 | ||
| Affected household, non-potable use of tap water only | 6 (3·9) | 0·9 | 0·3–3·2 | 1·0 | 0·3–3·7 |
| Affected household, used boiled tap water for potable purposes§ | 8 (10·6) | 2·6 | 0·7–9·5 | 2·1 | 0·5–8·3 |
| Affected household, use unboiled tap water for potable purposes§ | 32 (10·0) | 2·5 | 1·0–6·0 | 2·3 | 0·9–5·5 |
| Did not report obtaining tap water | 49 (10·3) | 2·6 | 1·1–6·2 | 2·2 | 0·8–5·6 |
| Burst pipes | |||||
| No | 67 (6·8) | 1·0 | 1·0 | ||
| Yes | 41 (9·8) | 1·5 | 0·8–2·6 | 1·4 | 0·7–2·7 |
*
Percentage estimates are weighted by inverse of sampling probability, adjusted for non-response.
†
Prevalence ratios (PR) and 95% confidence intervals (CI) estimated from weighted logistic regression models.
‡
All results shown are from separate models, each adjusted for age, race, employment, dwelling type, county of residence, and chronic health problems (respiratory or diabetes).
§
Potable purposes defined as drinking, cooking, brushing teeth, or preparing infant formula; regardless of treatment.