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Table 5 Reliability test of the HIS and each dimension

From: The reliability, validity and screening effect of the happiness index scale among inpatients in a general hospital

Reliability statistic
Dimension Number of items McDonald's ω(n = 8405) Guttman Split-Half (n = 8405) Test–retest reliability (n = 87)
Depression 2 0.798 0.792 0.809
Anxiety 2 0.815 0.814 0.863
Insomnia 2 0.891 0.891 0.800
Suicide 2 0.878 0.720 0.640
Total 8 0.825 0.920 0.745
  1. One Correlation Power Analysis: A sample size of 86 achieves 90% power to detect a difference of 0.20000 between the null hypothesis correlation of 0.75000 and the alternative hypothesis correlation of 0.55000 using a two-sided hypothesis test with a significance level of 0.05000
  2. The demographic distribution of the 87 retest samples was not significantly different from the total sample. See additional file 1 for details