Effect of household size on mental problems in children: results from the Norwegian Mother and Child Cohort study

Table 5 Adjusted mean scores (M) with confidence intervals (CI) of mental health related problems by types of relatives in the household

Types of relatives in the household	N^a Tot = 51 569	3 years		5 years		8 years
		Anxiety	Hyperactivity/concentration	Anxiety	Difficult temperament	Anxiety
		M (95 % CI)	M (95 % CI)	M (95 % CI)	M (95 % CI)	M (95 % CI)
Spouse of mother	49 859	-.02 (-.11, .05)	-.01 (-.08, .06)	-.06 (-.13, .02)	-.11 (-.21,-.02)	.01 (-.07, .10)
Parent(s) of mother	504	.04 (-.06, .14)	.00 (-.10, .09)	.01 (-.14, .16)	.00 (-.14, .15)	-.08 (-.27, .11)
Parent(s) in law	223	.13 (-.03, .28)	-.03 (-.16, .10)	.02 (-.18, .23)	.01 (-.18, .20)	-.01 (-.21, .18)
Children^b	21 944	-.23 (-.25,-.21)	-.11 (-.13,-.09)	-.14 (-.16,-.11)	-.15 (-.18,-.13)	-.09 (-.12,-.06)
Others	1 087	.03 (-.03, .09)	-.02 (-.08, .04)	-.04 (-.12, .04)	.10 (.01, .18)	.06 (-.05, .18)

^aTotal number of participants is for 3 years of age. The corresponding sample sizes are 28 627 for 5 years and 17 594 for 8 years
^bUsually siblings of the child participating in the study
The outcome scores are z-scaled (SD = 1). Each row represents separate dichotomous variables, a subject may have checked for none, some, or all. The effects of each of the variables in the Table were adjusted for each other, as well as for maternal age, maternal and paternal educational level, family income, maternal and paternal period of leave from work after birth, maternal breastfeeding status when child is 18 months, and animals in the family. Significant effects (p < 0.05) in bold