Primary outcome measures at 3-month and 12-month follow-up by treatment arm
| Outcome measure | Median temperature °C (IQR) | |||
|---|---|---|---|---|
| 3 Months | Intervention arm (n=15) | Control arm (n=15) | Difference between medians (95% CI) | p Value |
| Bath hot tap water temperature* | 45.0 (45.0–46.0) | 56.0 (52.0–59.0) | −11.0 (−14.3 to −7.7) | <0.001 |
| Change in bath hot tap water temperature from baseline to 3 months† | −9.0 (−16.0 to −8.0) | −1.0 (−7.0 to 1.0) | −8.0 (−13.3 to −2.7) | <0.001 |
| Sink hot tap water temperature* | 54.0 (53.0–56.0) | 54.0 (51.0–58.0) | 0.0 (−3.5 to 3.5) | 0.74 |
| Change in sink hot tap water temperature from baseline to 3 months† | 0.0 (−3.0 to 0.0) | −2.0 (−7.0 to 1.0) | 2.0 (−2.0 to 6.0) | 0.53 |
| Accounting for missing values at 3 months | Intervention arm (n=22) | Control arm (n=18) | Difference between medians (95% CI) | p Value |
|---|---|---|---|---|
| Bath hot tap water temperature—accounting for missing values‡ | 46.0 (45.0–54.3) | 56.5 (52.8–58.3) | −10.5 (−15.1 to −5.9) | <0.001 |
| Sink hot tap water temperature—accounting for missing values‡ | 54.5 (53.0–55.3) | 55.0 (51.8–58.0) | −0.5 (−3.4, 2.4) | 0.58 |
| 12 Months | Intervention arm (n=16) | Control arm (n=15) | Difference between medians (95% CI) | p Value |
|---|---|---|---|---|
| Bath hot tap water temperature* | 46.0 (45.3–46.0) | 55.0 (52.0–58.0) | −9.0 (−11.8 to −6.2) | <0.001 |
| Change in bath hot tap water temperature from baseline to 12 months† | −11.0 (−13.8 to −9.0) | −3.0 (−6.0–0.0) | −8.0 (−11.5 to −4.5) | <0.001 |
| Sink hot tap water temperature* | 53.0 (51.0–58.0) | 57.0 (52.0–65.0) | −4.0 (−10.9, 2.9) | 0.32 |
| Change in sink hot tap water temperature from baseline to 12 months† | −4.5 (−8.8 to −0.3) | −3.0 (−6.0–2.0) | −1.5 (−6.8, 3.8) | 0.44 |
| Accounting for missing values at 12 months | Intervention arm (n=26) | Control arm (n=27) | Difference between medians (95% CI) | p Value |
|---|---|---|---|---|
| Bath hot tap water temperature—accounting for missing values‡ | 46.5 (46.0–55.0) | 58.0 (53.0–60.0) | −11.5 (−15.8 to −7.2) | 0.001 |
| Sink hot tap water temperature—accounting for missing values‡ | 55.0 (52.8–60.0) | 58.0 (53.0–62.0) | −3.0 (−5.0 to 1.0) | 0.15 |
All participants were analysed as randomised regardless of the intervention received.
↵* Analyses include only participants with follow-up temperature measurements.
↵† The median baseline temperature for the treatment arm was used where families did not have water temperature measured at baseline.
↵‡ Missing follow-up water temperatures were replaced with baseline values, or where water temperature was not measured at baseline, they were replaced with the median baseline temperature for the treatment arm.