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. Author manuscript; available in PMC: 2008 Jul 1.
Published in final edited form as: Matern Child Nutr. 2007 Jul;3(3):174–185. doi: 10.1111/j.1740-8709.2007.00097.x

Fig. 4.

Fig. 4

Per cent of parity 0 women stratified by age group that delivered preterm, adjusted for ethnicity, smoking, literacy, and maternal height and BMI in early pregnancy. All covariates set to their mean. Confidence intervals were calculated using a robust estimation of the variance. BMI, body mass index.