Table 3.

Adjusted multivariable linear regression analysis of the relationship between smoking exposure and episodic memory and overall cognitive function among older Chinese women (N=6875), 2011-2013-2015

Variables	Episodic memory			Overall cognition
	β coefficient	95% CI	t	β coefficient	95% CI	t
Age	−0.04*	−0.05 to 0.03	−11.37	−0.06*	−0.07 to −0.04	−7.87
Expenditure	0.00	0.00 to 0.00	1.30	0.00*	0.00 to 0.00	0.32
SHS exposure†
≥25 to <30 years	−0.04	−0.16 to 0.08	−0.67	−0.01	−0.25 to 0.25	−0.01
≥30 to <40 years	0.02	−0.09 to 0.13	0.36	−0.05	−0.29 to 0.19	−0.41
≥40 years	−0.16‡	−0.31 to −0.01	−2.06	−0.33*	−0.66 to 0.01	−1.93
Baseline episodic memory	0.30*	0.28 to 0.32	25.22
Baseline overall cognition				0.55*	0.46 to 0.83	44.95
Urban§	0.25*	0.16 to 0.34	5.60	0.65*	0.46 to 0.83	6.68
Education¶
Primary	0.70*	0.58 to 0.80	12.42	1.77*	1.53 to 2.02	14.28
Secondary or above	0.97*	0.86 to 1.08	17.29	2.00*	1.74 to 2.26	15.24
Hypertension**
With treatment	0.04	−0.16 to 0.23	0.35	0.13	−0.29 to 0.56	0.62
Without treatment	0.06	−0.06 to 0.17	0.95	0.12	−0.14 to 0.38	0.93
Missing group	0.07	−0.12 to 0.25	0.70	0.10	−0.27 to 0.47	0.52
Diabetes††
With treatment	−0.20‡	−0.38 to 0.02	−2.20	−0.04	−0.43 to 0.36	0.62
Without treatment	−0.07	−0.25 to 0.11	−0.77	0.08	−0.30 to 0.47	0.43
Missing group	0.32	−0.16 to 0.80	1.30	0.87	−0.11 to 1.84	1.75
Baseline CES-D score	−0.01‡	−0.01 to 0.00	−1.59	−0.01	−0.03 to 0.00	−2.57
Year=2	−0.24	−0.33 to −0.15	−5.21	−0.17	−0.37 to 0.03	−1.70
Constant	0.63	0.53 to 0.74	11.54	6.48*	5.59 to 7.37	14.28

*p<0.01.

†Reference: No SHS exposure or <25 years.

‡p<0.05.

§Expenditure is expressed as the natural log of the annual household expenditure.

¶Reference: Illiterate.

**Reference: Without hypertension.

††Reference: Without diabetes.

‡‡p<0.1.

§§This model adjusted for age, expenditure, living area, education, baseline hypertension, diabetes, depression status and baseline cognitive function.

CES-D, Center for Epidemiologic Studies Depression Scale; SHS, secondhand smoke.