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Odds ratios tap water versus water container and reuse of plastic container
| Container | Odds Ratio | 95% CI of OR |
| Tap vs. Plastic | 6.53 | 2.2 – 27.9 |
| Used plastic vs. new plastic * | 1.87 | 1.06 – 3.31 |
| Tap vs. Metal | 2.76 | 0.76 – 13.18 |
* Used plastic container had previously been used to store chemicals, whereas new container not. Tap stands here for the tap in the house, not the communal tap.
