The 14-Item MHC-SF Holds Up in 1,932 Dutch Adults (Lamers et al., 2011)

The Question

Does the short, 14-item version of Keyes' Mental Health Continuum measure flourishing as reliably as the 40-item original, and does it work outside the United States?

What They Found

• The three-factor structure (emotional, social, psychological well-being) fit the data better than a single-factor model, confirming Keyes' design
• Internal reliability was strong: Cronbach's alpha was 0.89 overall, with subscale alphas above 0.74
• Test-retest scores stayed stable over 3 and 9 months, meaning the MHC-SF reflects something durable and not just a passing mood
• 36.5% of the Dutch sample met the flourishing criteria, 11.5% were languishing, and the rest landed in the moderate band, mirroring the spread Keyes found in the US
• The MHC-SF correlated as expected with personality, life satisfaction, and clinical symptom measures, supporting its use alongside the PERMA-Profiler and the WHO-5

How They Tested It

• Recruited a representative Dutch adult sample of 1,932 people aged 18 to 87 through an established online research panel
• Administered the MHC-SF alongside validated measures of life satisfaction, personality, and psychopathology to test convergent and divergent validity
• Re-tested subgroups at 3 and 9 months to check stability and short-term change
• Ran confirmatory factor analysis to compare the three-factor model against single-factor and two-factor alternatives

Caveats

• The sample was drawn entirely from a single Western European country; cross-cultural extension came from work like Keyes et al. (2008) in South Africa
• The social well-being subscale had the weakest factor loadings, a pattern that has recurred in later replications
• Test-retest stability was tested across months, not years; very long-term reliability is still under-studied