Phylogenetic analysis highlights the role of older people in the transmission of HIV-1 in Fuyang, Anhui Province, China

Table 1 Demographic differences of older people group vs. non-old aged group with HIV-1 infection in Fuyang city

	Total^a		Older people group (≥50 years old)		Non-old aged group (< 50 years old)		χ² P value^#
	n	%	n	%	n	%
Sex
Male	270	81.08	99	78.57	171	82.61	0.44
Female	63	18.92	27	21.43	36	17.39
Transmission category
Heterosexual contact	202	60.66	113	89.68	89	43.00	< 0.001
MSM	128	38.44	11	8.73	117	56.52
IDU	1	0.30	1	0.79	0	0
Heterosexual/IDU	1	0.30	0	0	1	0.48
Unknown	1	0.30	1	0.79	0	0
Education
Illiteracy	45	13.51	40	31.75	5	2.41	< 0.001
Primary school	98	29.43	49	38.89	49	23.67
Middle school	116	34.83	27	21.43	89	43.00
High school	45	13.51	10	7.94	35	16.91
College or bachelor above	29	8.71	0	0	29	14.01
Marriage
Married	195	58.56	78	61.90	117	56.52	< 0.001
Unmarried	74	22.22	11	8.73	63	30.43
Divorced or Unmatched	63	18.92	37	29.37	26	12.56
Unknown	1	0.30	0	0	1	0.48

^aOnly 333 HIV-1 infected people with demographic date are shown
# All statistical analyses were tested with the Pearson’s χ² test based on a two-sided of 0.05 using R version 3.5.1

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