Interviewer effects in a survey examining pain intensity and pain interference in nursing home residents.

INTRODUCTION: Face-to-face surveys are applied frequently when conducting research in older populations. Interviewers play a decisive role in data quality, may affect measurement and influence results. This study uses survey data about pain in nursing home residents and analyses, whether affiliation-of-interviewer (internal vs. external to nursing home) and gender-of-interviewer affect residents' responses in terms of interviewer variance and systematically varying pain reports. METHODS: Overall, 258 nursing home residents with up to moderate cognitive impairment were examined by 61 interviewers about pain intensity and interference applying the Brief Pain Inventory. Interviewer variance was measured using intra-interviewer correlation coefficients (ρ). Two-factorial covariance analysis was applied to analyse whether pain intensity and interference scores differ by interviewer characteristics. RESULTS: Interviewer heterogeneity accounts for almost one quarter of total variance on average. Interviewer variance is higher for internal and male interviewers than for external and female interviewers. Covariance analyses show significant effects of interviewer characteristics on pain reports. Average pain intensity and interference scores vary considerably by interviewer gender and affiliation. Highest pain intensity was reported towards female internal and male external interviewers; highest pain interference was reported towards male external interviewers. CONCLUSION: Residents' answers substantially differ in relation to who is assessing pain. There is a risk of imprecise and biased survey estimates on sensitive topics like pain in nursing homes. Interviewer gender and affiliation seem to evoke gender-specific and status-related expectations and attributions which influence residents' response process. Interviewer effects pose a considerable threat to survey data quality in institutionalised older populations.

Effects of age and cognitive function on data quality of standardized surveys in nursing home populations.

BACKGROUND: Data quality is of special concern when it comes to survey research in nursing homes. Very little is known about specifics of cognitively impaired elderly in responding to survey questions. This study examines effects of cognitive impairment, age, gender, and interview duration on the data quality in a sample of 659 nursing home residents (NHR). METHODS: Within a cross-sectional design, survey methodology was used to evaluate the pain situation in 13 nursing homes. Residents were stratified into NHR with no/mild (Mini-Mental State Examination MMSE: 18-30) and NHR with moderate (MMSE: 10-17) cognitive impairment. Data quality is measured by item nonresponse (INR). Correlation analyses, ANCOVA, linear and logistic regression models are applied. RESULTS: Neither interview duration nor gender have effects on item nonresponse. Age accounts for higher INR (ß = 0.12, p < 0.001). Cognitive impairment strongly predicts INR (ß = - 0.40, p < 0.001). INR significantly differs between NHR with no/mild (3.98%) and moderate cognitive impairment (11.85%). The likelihood of INR > 5% for residents with moderate cognitive impairment is 3.8-times (p < 0.001) of that for those with no/mild impairment. CONCLUSIONS: Surveys are adequate for residents with no/mild cognitive impairment but data quality is threatened in residents with moderate impairments. Precision and validity of responses from NHR with progressed cognitive impairment are potentially limited and results may be biased. The results clearly do support the need for a multidisciplinary 'general theory' of the question-/answer-process which has to be also inclusive for cognitively impaired elderly persons.

[Trialogical Evaluation of a Gerontological Psychiatric Consulting and Liaison Service]. / Trialogische Evaluierung eines gerontopsychiatrischen Konsiliar- und Liaisondienstes.

Objective: The presented project shows the effects of a gerontological psychiatric consulting and liaison service (C&L) on nursing home residents and the care team. Methods: The implementation of the C&L was evaluated using a quasi-experimental design in longitudinal section of residents', nursing, medical and family perspective using quantitative and qualitative methods. Results/Conclusion: The results provide evidence for the positive effects of C&L especially in relation to the "common action" within the care team.