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.

Hayward et al.

Hayward et al. BMC Public Health 2012 12:333   doi:10.1186/1471-2458-12-333

Open Data