Table 2

OR and 95% CI for small for gestational age births: results of multi-level logistic regression models

		With neighbourhood-level variables	Full model^*
	Empty model	OR (95% CI)	OR (95% CI)	p Value
Neighbourhood-level variable^†
Low		1	1
Moderate		1.09 (1.05 to 1.13)	1.08 (1.04 to 1.12)	<0.001
High		1.38 (1.32 to 1.44)	1.28 (1.22 to 1.34)	<0.001
Age (years)
20–24			1
25–29			1.03 (0.99 to 1.08)	0.162
30–34			1.23 (1.18 to 1.29)	<0.001
35–39			1.52 (1.44 to 1.60)	<0.001
40–44			1.82 (1.68 to 1.97)	<0.001
Marital status
Married/cohabiting			1
Never married, widowed or divorced			1.12 (1.09 to 1.15)	<0.001
Family income (quartiles)
High income			1
Middle-high income			1.04 (0.99 to 1.08)	0.089
Middle-low income			1.12 (1.07 to 1.18)	<0.001
Low income			1.47 (1.40 to 1.53)	<0.001
Education attainment
Compulsory school or less (≤9 years)			1.24 (1.19 to 1.29)	<0.001
Practical high school or some theoretical high school (10–11 years)			1.10 (1.06 to 1.13)	<0.001
Theoretical high school and/or college (≥12 years)			1
Urban/rural status
Large cities			1
Middle-sized towns			0.98 (0.94 to 1.01)	0.194
Small towns/rural areas			0.98 (0.95 to 1.01)	0.230
Employment
Yes			1
No			0.95 (0.92 to 0.99)	0.005
Mobility
Did not move			1
Consistently low/moderate deprivation			1.05 (1.00 to 1.09)	0.046
Consistently high deprivation			1.15 (1.05 to 1.26)	0.003
Downward mobility			1.01 (0.95 to 1.07)	0.842
Upward mobility			1.16 (1.10 to 1.23)	<0.001
Variance (SE)	0.037 (0.006)	0.017 (0.005)	0.014 (0.005)
Explained variance (%)		54	62

↵* The full model included all the neighbourhood-level and individual-level variables added into the model simultaneously.
↵† Low deprivation neighbourhoods represent the most affluent neighbourhoods and high deprivation neighbourhoods represent the most deprived neighbourhoods.