Investigating maternal risk factors as potential targets of intervention to reduce socioeconomic inequality in small for gestational age: a population-based study

Table 7 Crude calculated risks of SGA after reduced smoking, underweight or shorter height prevalence

	Observed			SGA with reduced smoking prevalence *
Model 1		SGA			SGA			SGA
Average income quintile	% smokers	n	%	% smokers	n	%	% smokers	n	%
1 ($6,196–$24,444)	6.0	1018	8.9	3.9	1014	8.9	0.0	1006	8.8
2 ($24,444–$28,440)	7.0	916	8.0	3.9	915	7.9	0.0	913	7.9
3 ($28,440–$32,954)	6.8	876	7.3	3.9	871	7.3	0.0	864	7.2
4 ($32,986–$38,832)	5.7	752	6.2	3.9	742	6.1	0.0	719	5.9
5 ($38,837–$509,269)	3.9	675	5.6	3.9	675	5.6	0.0	660	5.5
Total	5.9	4237	7.2	3.9	4216	7.1	0.0	4162	7.0
	Observed			SGA with reduced underweight prevalence *
Model 2		SGA			SGA			SGA
Average income quintile	% underweight	n	%	% underweight	n	%	% underweight	n	%
1 ($6,196–$24,444)	9.5	1018	8.9	5.6	992	8.7	0.0	955	8.3
2 ($24,444–$28,440)	7.6	916	8.0	5.6	901	7.8	0.0	860	7.5
3 ($28,440–$32,954)	6.5	876	7.3	5.6	867	7.3	0.0	815	6.8
4 ($32,986–$38,832)	5.7	752	6.2	5.6	752	6.2	0.0	735	6.0
5 ($38,837–$509,269)	5.6	675	5.6	5.6	675	5.6	0.0	628	5.2
Total	6.9	4237	7.2	5.6	4186	7.1	0.0	3992	6.8
	Observed			SGA with reduced shorter height prevalence *
Model 3		SGA			SGA			SGA
Average income quintile	% shorter height**	n	%	% shorter height	n	%	% shorter height	n	%
1 ($6,196–$24,444)	85.9	1018	8.9	70.5	932	8.1	0.0	538	4.7
2 ($24,444–$28,440)	81.6	916	8.0	70.5	864	7.5	0.0	533	4.6
3 ($28,440–$32,954)	77.0	876	7.3	70.5	841	7.0	0.0	461	3.9
4 ($32,986–$38,832)	72.5	752	6.2	70.5	743	6.1	0.0	410	3.4
5 ($38,837–$509,269)	70.5	675	5.6	70.5	675	5.6	0.0	377	3.1
Total	77.4	4237	7.2	70.5	4055	6.9	0.0	2319	3.9

* SGA risks over 3.7 year period of study under scenarios of reduced maternal risk factors calculated by assuming crude risks of SGA would remain constant within joint levels of average income quintile and smoking (model 1), average income quintile and underweight (model 2), and average income quintile and shorter height (model 3).
** Shorter height defined as bottom four quintiles of height.

ISSN: 1471-2458