The World Health Organization multinational study of breast-feeding and lactational amenorrhea. II. Factors associated with the length of amenorrhea

Regression Models and Life-Tables

D. R. Cox · Journal of the Royal Statistical Society Series B (Statistical Methodology) · 1972 · 39.3K citations · Full text

Public Health, Biostatistics, Hazard Identification +16

The Design and Analysis of Clinical Experiments.

Michael Hills, Joseph L. Fleiss · Journal of the Royal Statistical Society Series A (General) · 1987 · 3.3K citations

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Menstrual Cycles: Fatness as a Determinant of Minimum Weight for Height Necessary for Their Maintenance or Onset

Rose E. Frisch, Janet W. McArthur · Science · 1974 · 1.4K citations

Medicine, Endocrinology, Gynecology +16

DURATION OF BREAST-FEEDING AFTER EARLY INITIATION AND FREQUENT FEEDING

Ellena M Salariya, PhyllisM. Easton, J. I. Cater · The Lancet · 1978 · 246 citations

Public Health, Child Health, Nutrition +10

Risk of ovulation during lactation

Ronald H. Gray, Oona M. R. Campbell, R Apelo et al. · The Lancet · 1990 · 218 citations

Public Health, Maternal Health, Nutrition +13