The unidimensionality and cumulativeness of the subscales Health Perceptions, Mental Health, Physical Pain, and Social Functioning of the MOS Short-form General Health Survey were investigated using the Mokken Scale Analysis for Polychotomous Items (MSP). From the analyses, two unidimensional, cumulative subscales appeared, Health Perceptions including the item on Social Functioning, and Mental Health. Both subscales met the requirements of the Mokken model, with the first scale being a ‘moderately strong’ hierarchical scale (H = 0.49, rho = 0.89) and the second a ‘weak’ hierarchical scale (H = 0.38, rho = 0.85).
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