Fig. 1.

Relationship network and data basis. a Relationship network between immunological markers, metabolic syndrome, abdominal obesity, and centenarian longevity in the oldest-old population. b Prevalence rates of metabolic syndrome and abdominal obesity and immunoglobulin E (IgE) and complement component 3 (C3) and 4 (C4) levels in centenarians and other oldest-old individuals (<100 years). c IgE, C3, and C4 levels of centenarians with and without metabolic syndrome. d IgE, C3, and C4 levels of centenarians with and without abdominal obesity