Table 4 Evaluation of multimorbidity and multimorbidity networks.

Group		Network density	Average degree	Average degree of CVD-H-H^b	CCI
Group		Network density	Average degree	Average degree of CVD-H-H^b	CVD	non-CVD	Z	P-value
Total	—	0.305	5.80	29.33 (10, 19, 15)	3.80 ± 1.62	1.19 ± 1.34	72.26	<0.001
Sex	Male	0.170	3.74	24.67 (8, 14, 15)	3.71 ± 1.54	1.20 ± 1.31	45.41	<0.001
Sex	Female	0.296	6.52	32.00 (14, 21, 13)	3.86 ± 1.66	1.18 ± 1.38	55.82	<0.001
Age^a	Young	0.065	1.36	8.00 (0, 8, 4)	1.72 ± 1.03	0.29 ± 0.56	21.99	<0.001
	Middle-age	0.303	6.36	32.00 (11, 21, 16)	3.52 ± 1.44	1.48 ± 1.24	55.15	<0.001
	Old	0.156	3.27	22.67 (11, 12, 11)	5.22 ± 1.26	3.74 ± 1.08	23.09	<0.001

^aThe people with age less than 40 (age ≤ 40) were viewed as young, and people with 41 ≤ age ≤ 65 and age ≥ 66were middle-age and old, respectively.
^bCVD-H-H refers to the “CVD-Hyperlipidemia-Hypertension” triangle in the network, and the values in the brackets are degrees of CVD, hyperlipidemia and hypertension.

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