Table 3

OR and 95% CI* of having a physical health problem by socioeconomic position (SEP) group

Outcome, combined across age groups (% with problem)	SEP group (Reference group 1 is least disadvantaged; group 5 is most disadvantaged)				Test for association p value^†	Test for non-linearity p value^‡	Test for age interaction p value^§
Outcome, combined across age groups (% with problem)	2	3	4	5	Test for association p value^†	Test for non-linearity p value^‡	Test for age interaction p value^§
General health (13.5%)	1.0 (0.9 to 1.2)	0.9 (0.8 to 1.9)	1.0 (0.9 to 1.2)	1.6 (1.3 to 1.8)	<0.001	<0.001	0.17
Special healthcare needs (11.5%)	1.0 (0.8 to 1.1)	1.0 (0.8 to 1.1)	1.1 (0.9 to 1.3)	1.3 (1.1 to 1.6)	<0.001	0.05	0.85
Illness with wheeze (22.1%)	1.1 (0.9 to 1.2)	1.1 (1.0 to 1.3)	1.3 (1.1 to 1.5)	1.5 (1.4 to 1.7)	<0.001	0.17	0.17
Sleep problems (17.1%)	1.2 (1.0 to 1.3)	1.1 (1.0 to 1.3)	1.3 (1.2 to 1.6)	1.6 (1.3 to 1.8)	<0.001	0.23	0.16
Injury (14.9%)	0.9 (0.8 to 1.1)	1.1 (0.9 to 1.3)	1.1 (0.9 to 1.3)	1.2 (1.0 to 1.4)	0.007	0.31	0.57

↵* All models adjusted for age of child's primary carer and child gender.
↵† p Value for logistic regression of SEP and outcome.
↵‡ p Value for test of non-linearity in the relationship between SEP group and outcome.
↵§ p Value for test of interaction between SEP and age group.