Figure 3.

Multimorbidity networks by age group, where (a) for young (age ≤ 40), (b) for middle-age (41 ≤ age ≤ 65), and (c) for old (age ≥ 66), “Prostate” represented “Prostate hyperplasia or inflammation”, “Gynecological” represented gynecological inflammation, “Gastric ulcer” represented gastric ulcer or duodenal ulcer; “other tumor” represented tumors except 9 cancer like liver cancer, lung cancer, etc., and “other digestive” represented other diseases of digestive system except 7 ones like fatty liver, cirrhosis, etc.