Answers are grounded in this paper and cite their sources.
Article Multifactorial study of the risk of prematurity at 32 weeks of gestation. I. A study of the frequency of 30 predictive characteristics was published on January 1, 1974 in the journal Journal of Perinatal Medicine (volume 2, issue 1).
No takes yet. Share an insight, caveat, or question.
Papiernik et al. (1974) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: