. 2017 May 19;17:111. doi: 10.1186/s12877-017-0502-8

Table 1.

Crude mean (standard deviation) for physical and mental health component summary scores among the study population, by covariates (n = 12,132)

	n	Physical Health Component Summary								Mental Health Component Summary
	n	Mean (SD)							P value	Mean (SD)								P value
Gender
Male	5,126	49.08 (6.69)							0.731^a	51.17 (6.00)								<0.001^a
Female	7,006	49.13 (6.68)							0.731^a	50.58 (6.00)								<0.001^a
Age at survey
65-67	5,798	49.27 (6.52)							0.012^a	50.75 (5.97)								0.178^a
68-70	6,334	48.96 (6.82)							0.012^a	50.90 (6.04)								0.178^a
Family size
1	1,775	48.41 (7.24)	*	*	*				<0.001^b	49.93 (6.65)	*	*	*	*				<0.001^b
2	6,291	49.29 (6.49)	*							51.12 (5.86)	*
3	2,493	49.10 (6.69)		*						50.76 (5.92)		*
≥4	1,478	49.14 (6.76)			*					50.71 (5.92)			*
Missing	95	49.72 (6.46)								51.70 (4.64)				*
Body mass index
Normal	8,798	49.63 (6.31)	*	*					<0.001^b	50.91 (5.91)	*							<0.001^b
Thin	1,009	49.02 (6.89)	*		*					49.75 (6.62)	*	*
Overweight	2,225	47.09 (7.56)		*	*	*				51.02 (6.04)		*
Missing	100	48.98 (7.17)				*				50.10 (6.22)
Number of chronic diseases under medical treatment
None	4,852	50.17 (6.04)	*	*	*				<0.001^b	51.18 (5.55)	*	*	*					<0.001^b
1	2,716	49.27 (6.41)	*			*	*			50.55 (6.34)	*
2	2,515	48.47 (6.89)		*		*		*		50.78 (5.97)		*
≥3	2,049	47.16 (7.65)			*		*	*		50.43 (6.57)			*
Smoking
Never-smoker	6,809	49.31 (6.54)	*	*					0.003^b	50.86 (5.87)	*							0.002^b
Ex-smoker	3,551	48.90 (6.72)	*							50.99 (5.95)		*
Current smoker	1,555	48.79 (7.13)		*						50.30 (6.76)	*	*
Missing	217	48.62 (6.94)								50.93 (5.18)
Frequency of alcohol consumption
None	4,737	48.53 (7.15)	*	*	*				<0.001^b	50.41 (6.35)	*	*	*					<0.001^b
Social	2,679	49.26 (6.60)	*							50.87 (5.73)	*			*	*
Occasional	1,890	49.56 (6.23)		*						51.10 (5.61)		*				*
Daily	2,768	49.64 (6.13)			*					51.36 (5.85)			*	*			*
Missing	58	49.05 (7.03)								48.59 (6.69)					*	*	*
Depression
Absent	9,338	49.89 (5.98)	*	*					<0.001^b	51.97 (4.92)	*	*						<0.001^b
Present	2,577	46.31 (8.17)	*		*					46.69 (7.58)	*		*
Missing	217	48.57 (6.56)		*	*					50.65 (5.93)		*	*
Cognitive functioning
Intact	10,587	49.57 (6.38)	*						<0.001^b	51.28 (5.61)	*							<0.001^b
Poor	1,524	45.94 (7.80)	*							47.68 (7.50)	*
Missing	21	48.64 (7.10)								49.37 (9.39)

^aDifferences between two groups were analyzed using the t test

^bDifferences between three or more groups were analyzed using one-way analysis of variance (ANOVA)

^* P<0.05 with multiple comparison test by the Tukey method