Table 2. Multivariate analysis for incident dementia in older people in Anhui, China.

Variable†	Multiple adjusted analysis
	OR	95%CI	P
Basic characteristics
Age (years)	1.04	(1.00–1.09)	0.047
Sex
Men	1.00
Women	2.48	(1.20–5.13)	0.014
Body mass index (kg/m2)
<20	1.00
20–<23	0.96	(0.47–2.00)	0.922
23–<26	0.63	(0.30–1.33)	0.223
≥26	0.45	(0.20–1.05)	0.066
Urban-rurality
Urban	1.00
Rural	0.91	(0.14–5.70)	0.916
Socio-economic position, lifestyles, and hobby
Educational level
≥High secondary school	1.00
Secondary school	1.35	(0.70–2.61)	0.365
Primary school	2.12	(1.03–4.38)	0.042
Main occupation
Officer/teacher	1.00
Businessmen/non-labouring worker	0.60	(0.18–1.94)	0.389
Manual labourer	1.93	(0.97–3.87)	0.063
Peasant	1.33	(0.60–2.99)	0.483
Annual income
Very satisfactory	1.13	(0.56–2.24)	0.737
Satisfactory	1.00
Average	0.53	(0.21–1.37)	0.190
Poor or Financial problems	0.87	(0.27–2.80)	0.809
Smoking habits
Never-smoking	1.00
Ex-smoking	1.66	(0.53–5.16)	0.383
Current-smoking	2.39	(1.21–4.72)	0.012
Painting/playing chess/flower planting/pet
Yes	1.00
No	1.16	(0.67–1.98)	0.599
Angina
No	1.00
Yes	2.58	(1.01–6.59)	0.047
Social network
Good relation with others, ease in acquiring friends
Yes	1.00
No	0.90	(0.38–2.13)	0.814
Living with
No-one/Others	1.00
Spouse only or Parents only	0.69	(0.35–1.36)	0.282
Children and/or Grant children only	0.55	(0.23–1.33)	0.185
Spouse and/or grand/children and/or parents	0.36		0.012
Psychosocial factors		0.16–0.80)
Worrying
No	1.00
Yes	1.45	(0.78–2.69)	0.241
Hypochondriasis
No	1.00
Yes	1.81	(0.90–3.65)	0.095
Anything (else) severely upsetting
No	1.00
Yes	1.62	(0.55–4.78)	0.385
Horrifying experience (including, accident, fire, physical attack, etc)
No	1.00
Yes	1.70	(0.62–4.63)	0.302

^†including all variables which had significant level < = 0.100 from age-sex adjustment analysis in Table S1, which were listed in table 2.