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. Author manuscript; available in PMC: 2014 Jan 19.
Published in final edited form as: Lancet. 2012 Nov 16;381(9862):223–234. doi: 10.1016/S0140-6736(12)61856-X

Figure 1. Country selection process for preterm birth rate trends analyses.

Figure 1

Figure 1

a. Inclusion criteria for countries with reliable preterm birth trend data

b. Examination of “high-income” country groupings with best fit for countries with high-quality preterm birth data

Notes: Data on preterm prevalence from Blencowe H et al Lancet 2012.4For country groupings see webappendix webtable 1, p. 1-2