Penelope P Howards

Summary

Affiliation: National Institutes of Health
Country: USA

Publications

  1. ncbi request reprint Disentangling causal paths between obesity and in vitro fertilization outcomes: an intractable problem?
    Penelope P Howards
    Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, Bethesda, Maryland 20892, USA
    Fertil Steril 89:1604-5. 2008
  2. ncbi request reprint Potential confounding by exposure history and prior outcomes: an example from perinatal epidemiology
    Penelope P Howards
    Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, Bethesda, Maryland 20892, USA
    Epidemiology 18:544-51. 2007
  3. ncbi request reprint Misclassification of gestational age in the study of spontaneous abortion
    Penelope P Howards
    Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, Bethesda, MD, USA
    Am J Epidemiol 164:1126-36. 2006
  4. ncbi request reprint Conditions for bias from differential left truncation
    Penelope P Howards
    Division of Epidemiology, Statistics and Prevention Research, National Institute of Child Health and Human Development, Rockville, MD 20852, USA
    Am J Epidemiol 165:444-52. 2007
  5. pmc Effect of daily fiber intake on reproductive function: the BioCycle Study
    Audrey J Gaskins
    Division of Epidemiology, Statistics, and Prevention Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
    Am J Clin Nutr 90:1061-9. 2009
  6. ncbi request reprint Birth weight, postnatal growth, and risk for high blood pressure at 7 years of age: results from the Collaborative Perinatal Project
    Anusha H Hemachandra
    Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892, USA
    Pediatrics 119:e1264-70. 2007
  7. ncbi request reprint Invited commentary: disinfection by-products and pregnancy loss--lessons
    Penelope P Howards
    Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, Bethesda, MD, USA
    Am J Epidemiol 164:1052-5. 2006
  8. pmc Timing clinic visits to phases of the menstrual cycle by using a fertility monitor: the BioCycle Study
    Penelope P Howards
    Division of Epidemiology, Statistics, and Prevention Research, the Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland, USA
    Am J Epidemiol 169:105-12. 2009
  9. ncbi request reprint Recruitment for a community-based study of early pregnancy: the Right From The Start study
    Joanne H E Promislow
    Department of Epidemiology, School of Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
    Paediatr Perinat Epidemiol 18:143-52. 2004
  10. ncbi request reprint Caffeine and miscarriage risk
    David A Savitz
    Department of Community and Preventive Medicine, Mount Sinai School of Medicine, New York, New York 10029, USA
    Epidemiology 19:55-62. 2008

Detail Information

Publications12

  1. ncbi request reprint Disentangling causal paths between obesity and in vitro fertilization outcomes: an intractable problem?
    Penelope P Howards
    Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, Bethesda, Maryland 20892, USA
    Fertil Steril 89:1604-5. 2008
    ..Disentangling causal paths between obesity and in vitro fertilization outcomes may be an intractable problem, but other research questions of clinical importance can be addressed through appropriate study designs and analytic methods...
  2. ncbi request reprint Potential confounding by exposure history and prior outcomes: an example from perinatal epidemiology
    Penelope P Howards
    Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, Bethesda, Maryland 20892, USA
    Epidemiology 18:544-51. 2007
    ..There is no single answer as to whether reproductive history should be included in the model; the decision depends on the research question and the underlying DAG...
  3. ncbi request reprint Misclassification of gestational age in the study of spontaneous abortion
    Penelope P Howards
    Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, Bethesda, MD, USA
    Am J Epidemiol 164:1126-36. 2006
    ..Bias was greatest when the magnitude of error for pregnancies at higher risk was much larger than that for pregnancies at lower risk...
  4. ncbi request reprint Conditions for bias from differential left truncation
    Penelope P Howards
    Division of Epidemiology, Statistics and Prevention Research, National Institute of Child Health and Human Development, Rockville, MD 20852, USA
    Am J Epidemiol 165:444-52. 2007
    ..Cox regression can correct for left truncation and is no more difficult to perform than logistic regression...
  5. pmc Effect of daily fiber intake on reproductive function: the BioCycle Study
    Audrey J Gaskins
    Division of Epidemiology, Statistics, and Prevention Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
    Am J Clin Nutr 90:1061-9. 2009
    ..The influence of fiber on aspects of reproduction, which include ovulation, has not been well studied in premenopausal women...
  6. ncbi request reprint Birth weight, postnatal growth, and risk for high blood pressure at 7 years of age: results from the Collaborative Perinatal Project
    Anusha H Hemachandra
    Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892, USA
    Pediatrics 119:e1264-70. 2007
    ....
  7. ncbi request reprint Invited commentary: disinfection by-products and pregnancy loss--lessons
    Penelope P Howards
    Division of Epidemiology, Statistics, and Prevention Research, National Institute of Child Health and Human Development, Bethesda, MD, USA
    Am J Epidemiol 164:1052-5. 2006
  8. pmc Timing clinic visits to phases of the menstrual cycle by using a fertility monitor: the BioCycle Study
    Penelope P Howards
    Division of Epidemiology, Statistics, and Prevention Research, the Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland, USA
    Am J Epidemiol 169:105-12. 2009
    ..Fertility monitors appear to be useful in timing clinic visits in a compliant population with flexible schedules...
  9. ncbi request reprint Recruitment for a community-based study of early pregnancy: the Right From The Start study
    Joanne H E Promislow
    Department of Epidemiology, School of Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
    Paediatr Perinat Epidemiol 18:143-52. 2004
    ..Although intensive, diverse efforts were required, when recruitment efforts were maximised, we successfully recruited over 10% of the estimated number of pregnant women in the community...
  10. ncbi request reprint Caffeine and miscarriage risk
    David A Savitz
    Department of Community and Preventive Medicine, Mount Sinai School of Medicine, New York, New York 10029, USA
    Epidemiology 19:55-62. 2008
    ..Coffee and caffeine have been inconsistently found to be associated with increased risk of clinical miscarriage-a potentially important association given the high prevalence of exposure...
  11. doi request reprint Invited commentary: the use of imperfect data--compromise or compromising?
    Penelope P Howards
    Epidemiology Department, Emory University, Atlanta, GA 30322, USA
    Am J Epidemiol 167:641-3; discussion 644-5. 2008
    ..Automated databases are certainly valuable, but they should be used with caution and where possible should be linked to databases that can fill the critical gaps...
  12. ncbi request reprint Hot tubs and miscarriage--methodological and substantive reasons why the case is weak
    Irva Hertz-Picciotto
    Department of Epidemiology and Preventive Medicine, University of California, Davis, Davis, CA 95616, USA
    Am J Epidemiol 158:938-40; discussion 941. 2003