Table 1. Frequency and incidence of accidents during bathtub bathing and showering.
| Bathtub bathing | Showering | |
| Weekly frequency (mean ± SD, n = 617) | 5.82 ± 2.09 | 1.29 ± 1.81 |
| age <67 y (n = 329) | 5.80 ± 2.12 | 1.49 ± 1.89 |
| age ≥67 y (n = 288) | 5.86 ± 2.05 | 1.06 ± 1.69 |
| Overall annual frequency (estimate) | 1.9 × 105 | 4.1 × 104 |
| age <67 y | 9.9 × 104 | 2.5 × 104 |
| age ≥67 y | 8.8 × 104 | 1.6 × 104 |
| Number of reported symptoms/accidents in the past year (n = 588) | ||
| Any symptom/accident | 8 | 1 |
| Any symptom/accident (age <67 y) | 6 | 1 |
| Any symptom/accident (age ≥67 y) | 2 | 0 |
| Pallor | 5 | 0 |
| Loss of consciousness | 2 | 1 |
| Falling | 1 | 0 |
| Nausea/Vomiting | 0 | 0 |
| Other | 0 | 0 |
| Incidence rate of symptoms/accidents per 10 000 baths/showers (95% CI) | ||
| Any symptom/accident | 0.43 (0.22–0.84) | 0.24 (0.04–1.37) |
| Any symptom/accident (age <67 y) | 0.60 (0.28–1.32) | 0.39 (0.07–2.22) |
| Any symptom/accident (age ≥67 y) | 0.23 (0.06–0.83) | 0 (0–2.41) |
| Pallor | 0.27 (0.11–0.63) | 0 (0–0.93) |
| Loss of consciousness | 0.11 (0.03–0.39) | 0.24 (0.04–1.37) |
| Falling | 0.05 (0.01–0.31) | 0 (0–0.93) |
| Nausea/Vomiting | 0 (0–0.21) | 0 (0–0.93) |
| Other | 0 (0–0.21) | 0 (0–0.93) |
| Annual frequency in Japanese aged 40–74 years (estimate) | 1.7 × 1010 | 3.8 × 109 |
| Total annual number of accidents across the Japanese population aged 40–74 years (estimate) |
7.4 × 105 (3.8 × 105–1.5 × 106) | 9.3 × 104 (1.6 × 104–5.3 × 105) |
SD: standard deviation; CI: confidence interval.