Table 6.

Adjusted mean (standard error) for the Physical and Mental Health Component Summary Scores for the number of social groups, stratified by gender

	Males					P a	Females							P a	Interaction
	N	Mean (SE)					N	Mean (SE)
Physical Health Component Summary Score
None	1,680	46.31 (0.22)	*	*	*	0.002	1,825	45.70 (0.22)	*	*	*			<0.001	p = 0.080
1	1,428	47.02 (0.24)	*				1,848	46.32 (0.23)	*			*
2	959	47.08 (0.27)		*			1,470	46.53 (0.25)		*			*
≥3	1,059	47.11 (0.28)			*		1,863	47.24 (0.25)			*	*	*
Mental Health Component Summary Score
None	1,680	48.18 (0.19)	*			0.024	1,825	47.26 (0.20)	*	*	*			<0.001	p = 0.038
1	1,428	48.75 (0.21)	*				1,848	47.82 (0.21)	*			*
2	959	48.30 (0.24)					1,470	48.10 (0.22)		*
≥3	1,059	48.57 (0.24)					1,863	48.34 (0.22)			*	*

The data in this table are adjusted for age, family size, BMI, comorbidities, smoking, alcohol intake, depression and cognitive functioning

^aThis is by use of an analysis of covariance (ANCOVA) for differences in mean scores

^* P<0.05 with the Bonferroni correction method