Spirituality Studies 145 Muhammad Japar et al. Table 1 Psychometric Properties of the Meaning in Life Scale Across Measurement Points Dimension Time Point Cronbach’s α ICC (Single) 95% CI Item-Total r Range Self-Oriented Meaning Pre-test .938 .790 [.701.862] .828 –.886 Self-Oriented Meaning Post-test .922 .748 [.647.833] .790 –.858 Self-Oriented Meaning Follow-up .922 .747 [.646.833] .781 –.900 Other-Oriented Meaning Pre-test .928 .764 [.668.845] .798 –.861 Other-Oriented Meaning Post-test .889 .667 [.547.773] .707 –.838 Other-Oriented Meaning Follow-up .933 .777 [.685.854] .802 –.870 * ICC = Intraclass Correlation Coefficient (two-way mixed effects, consistency type). All Cronbach’s α values ≥.70 indicate acceptable to excellent internal consistency. ICC values ≥.75 indicate good reliability (Koo and Mae 2016). Table 3 Post-Hoc Statistical Power for Primary Effects Effect Partial η² Cohen’s f Power (1−β) Interpretation Gender (SOM) .183 .473 .97 Excellent Gender (OOM) .194 .491 .98 Excellent Time .164 .443 .58 Inadequate Time × Gender .283 .628 .97 Excellent Table 2 SOM–OOM Subscale Correlations Across Measurement Points Time Point r p Interpretation Pre-test .935 <.001 Very strong Post-test .923 <.001 Very strong Follow-up .926 <.001 Very strong
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