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Descriptive statistics of scores on the simplified Japanese version of the Athens Insomnia Scale (AIS‐SJ) and its subscales (n = 50 547)
| Scales | Skewness | Kurtosis | Mean | 95% confidence interval | Standard deviation | Median |
|---|---|---|---|---|---|---|
| Total (0–8) | 0.45 | −0.89 | 3.06 | 3.04–3.08 | 2.44 | 3 |
| Nocturnal (0–5) | 0.45 | −0.99 | 1.93 | 1.92–1.94 | 1.64 | 2 |
| Daytime (0–3) | 0.54 | −0.11 | 1.12 | 1.11–1.13 | 1.12 | 1 |
