Two populations with multiple sclerosis. Clinical and demographic characteristics

Area of Science:

• Neurology
• Epidemiology

Background:

• Multiple sclerosis (MS) is a chronic neurological disease with varying prevalence and incidence globally.
• Understanding geographic and demographic variations in MS is crucial for public health and research.

Purpose of the Study:

• To analyze and compare the characteristics and disease course of multiple sclerosis (MS) in two distinct US regions: King and Pierce (K-P) Counties, Washington, and Los Angeles (LA) County, California.
• To investigate differences in MS prevalence, incidence, age of onset, symptoms, and disability levels between the two study areas.

Main Methods:

• Cross-sectional analysis of 1,793 definite or probable multiple sclerosis (MS) cases from population surveys.
• Comparison of demographic factors, clinical presentation, and disability status between K-P Counties and LA County residents.

Main Results:

• MS patients were more likely to be divorced and have higher education levels than the general US population.
• Prevalence was higher in females and individuals born in northern regions. Peak incidence occurred in older age groups in K-P compared to LA.
• Earlier disease onset and higher disability were observed in LA County, suggesting a more aggressive disease course in this lower-prevalence area.

Conclusions:

• Geographic location and demographic factors influence multiple sclerosis (MS) prevalence and disease characteristics.
• The findings suggest a potentially more malignant course of MS in the lower-prevalence Los Angeles area compared to the higher-prevalence King and Pierce Counties.
• Further research is warranted to explore the environmental and genetic factors contributing to these observed differences.