The Nigerian Aging Males' Symptoms scale. Experience in elderly males.

BACKGROUND: The Aging Males' Symptoms scale (AMS) is an internationally used scale to analyse health related quality of life (HRQoL). The aim of this paper is to provide evidence that the Nigerian AMS scale measures HRQoL with similar accuracy as in other language versions. We also intended to show the severity of complaints of aging in males in advanced old age. More generally, we aim to demonstrate that the Nigerian AMS scale is an applicable, validated, sensitive instrument to measure HRQoL in Nigeria.

MATERIAL: We performed a representative survey in Nigeria to get data of the AMS scale in a group of males in old age. The survey was a household-based population sample conducted in March 2006. The Nigerian data were compared with existing data from other European countries. Only community-based data were used for this comparison.

RESULTS AND DISCUSSION: The internal structure of the AMS (factorial analysis) was sufficiently similar with the comparison group of other countries in Europe to conclude that the scale really measures the same phenomenon. The sub-scores and total score correlations were high (0.8-0.9) but lower among the sub-scales (0.4-0.8). This suggests that the domains are not fully independent. The reliability (consistency) was found to be good and almost identical with European countries. Mean scores of the Nigerian AMS did systematically differ from data of other European studies. There were much higher because of older age. The same applies for the population reference values obtained in Nigeria. It is the first time that population norm values are available for very old age.

CONCLUSION: The Nigerian AMS scale is a standardized HRQoL scale that showed good psychometric characteristics (reliability, validity) similar to other international versions. We suggest that the results obtained with the Nigerian AMS scale should be used preliminarily as reference for 'norm values' for highest age, i.e. in absence of other data. Confirmation in future studies is needed.