Table 2 Item characteristics of the BPS-J
From: Development and validation of the Japanese version of the Bedtime Procrastination Scale (BPS-J)
| Â | Mean | SD | Median | IQR |
|---|---|---|---|---|
Item 1 | 2.79 |  ± 1.12 | 3 | 2–4 |
Item 2 | 3.37 |  ± 1.09 | 3 | 3–4 |
Item 3 | 3.39 |  ± 1.32 | 3 | 2–5 |
Item 4 | 2.77 |  ± 1.18 | 3 | 2–4 |
Item 5 | 2.45 |  ± 1.15 | 2 | 2–3 |
Item 6 | 2.57 |  ± 1.17 | 2 | 2–3 |
Item 7 | 3.05 |  ± 1.30 | 3 | 2–4 |
Item 8 | 2.6 |  ± 1.19 | 3 | 2–3 |
Item 9 | 3.07 |  ± 1.23 | 3 | 2–4 |