Psychometric evaluation of the Nurses Observation Scale for Inpatient Evaluation in the Netherlands

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Abstract
The interrater reliability, temporal stability and factorial, convergent, discriminant and predictive validity of the Nurses Observation Scale for Inpatient Evaluation (NOSIE-30) were investigated in a heterogeneous group of psychiatric inpatients in the Netherlands (n = 179). Data in support of the scale's dimensional structure (recoverability of Anglo-American subscale structure in this Dutch sample and distinctiveness of subscales), discriminatory power and convergent validity are presented. Interrater reliability was satisfactory at global scale level. However, 3 subscales (irritability, psychosis and depression) were found to lack interrater reliability. Although temporal stability coefficients were high, large score changes are presupposed to show that pre- versus posttherapy differences are attributable to real change rather than error. NOSIE-30 had limited predictive value.