CoChat
Sign Up
Cited by 48

The DOI matches its Crossref record; 2 of the 2 references it cites were found in a registry or an index.

Placental weight and birthweight: the relations with number of daily cigarettes and smoking cessation in pregnancy. A population study

Larsen, Sandra, Haavaldsen, Camilla, Bjelland, Elisabeth Krefting, Dypvik, Johanne, Jukic, Anne Marie, Eskild, Anne·2018·International Journal of Epidemiology
DOI 10.1093/ije/dyy110PMC PMC6124614
Open this paper in CoChat — free account

Overview

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1093/ije/dyy110

Cites

2 of 2 references verified0 citation errors · 0 not checkable

Statistics

Figures

Figure 1. Flow chart of study sample.
Figure 1. Flow chart of study sample.CC BY-NC · PubMed Central
Figure 2. Estimated differences in placental weight, birthweight and placental to birthweight ratio according to number of daily cigarettes in the first trimester of pregnancy. Adjusted for year of delivery. (A-C) Non-smokers and daily smokers throughout pregnancy were included in the analyses (n = 660 154); (D-F) Non-smokers and women who stopped daily smoking after the first trimester were included in the analyses (n = 624 165). Non-smokers were used as the reference category. Data were fitted by the use of a linear regression model with restricted cubic splines with three knots (3, 7 and 15 daily cigarettes). Dashed lines represent 95% confidence intervals.
Figure 2. Estimated differences in placental weight, birthweight and placental to birthweight ratio according to number of daily cigarettes in the first trimester of pregnancy. Adjusted for year of delivery. (A-C) Non-smokers and daily smokers throughout pregnancy were included in the analyses (n = 660 154); (D-F) Non-smokers and women who stopped daily smoking after the first trimester were included in the analyses (n = 624 165). Non-smokers were used as the reference category. Data were fitted by the use of a linear regression model with restricted cubic splines with three knots (3, 7 and 15 daily cigarettes). Dashed lines represent 95% confidence intervals.CC BY-NC · PubMed Central
Figure 3. Estimated differences in placental weight z-scores and birthweight z-scores according to number of daily cigarettes in the first trimester of pregnancy. Adjusted for year of delivery. (A, B) Non-smokers and daily smokers throughout pregnancy were included in the analyses (n = 660 154). (C, D) Non-smokers and daily smokers who stopped after the first trimester (n = 624 165) were included in the analyses. Non-smokers were used as the reference category. Data were fitted by the use of a linear regression model with restricted cubic splines with three knots (3, 7 and 15 daily cigarettes). Dashed lines represent 95% confidence intervals.
Figure 3. Estimated differences in placental weight z-scores and birthweight z-scores according to number of daily cigarettes in the first trimester of pregnancy. Adjusted for year of delivery. (A, B) Non-smokers and daily smokers throughout pregnancy were included in the analyses (n = 660 154). (C, D) Non-smokers and daily smokers who stopped after the first trimester (n = 624 165) were included in the analyses. Non-smokers were used as the reference category. Data were fitted by the use of a linear regression model with restricted cubic splines with three knots (3, 7 and 15 daily cigarettes). Dashed lines represent 95% confidence intervals.CC BY-NC · PubMed Central

Verification

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Citations

Cites

Research works printed but not linked: 47

  1. Wilcox, 1992, Birth weight and perinatal mortality: the effect of gestational age, Am J Public Health, 82, 378, 10.2105/AJPH.82.3.378 · DOI
  2. Barker, 1993, The relation of small head circumference and thinness at birth to death from cardiovascular disease in adult life, BMJ, 306, 422, 10.1136/bmj.306.6875.422 · DOI
  3. Simpson, 1957, A preliminary report on cigarette smoking and the incidental prematurity, Am J Obstet Gynecol, 73, 808, 10.1016/0002-9378(57)90391-5 · DOI
  4. Bernstein, 2005, Maternal smoking and its association with birth weight, Obstet Gynecol, 106, 986, 10.1097/01.AOG.0000182580.78402.d2 · DOI · Paper page
  5. Andriani, 2014, Adverse effects of parental smoking during pregnancy in urban and rural areas, BMC Pregnancy Childbirth, 14, 414., 10.1186/s12884-014-0414-y · DOI
  6. Hebel, 1988, Dose-response of birth weight to various measures of maternal smoking during pregnancy, J Clin Epidemiol, 41, 483, 10.1016/0895-4356(88)90050-9 · DOI
  7. England, 2001, Effects of smoking reduction during pregnancy on the birth weight of term infants, Am J Epidemiol, 154, 694, 10.1093/aje/154.8.694 · DOI
  8. Roland, 2012, Fetal growth versus birthweight: the role of placenta versus other determinants, PLoS One, 7, e39324., 10.1371/journal.pone.0039324 · DOI
  9. Salafia, 2008, Placental characteristics and birthweight, Paediatr Perinat Epidemiol, 22, 229, 10.1111/j.1365-3016.2008.00935.x · DOI
  10. Williams, 1997, Prospective cohort study of factors influencing the relative weights of the placenta and the newborn infant, BMJ, 314, 1864, 10.1136/bmj.314.7098.1864 · DOI
  11. Spira, 1975, Smoking during pregnancy and placental weight. A multivariate analysis of 3759 cases, J Perinat Med, 3, 237, 10.1515/jpme.1975.3.4.237 · DOI
  12. Christianson, 1979, Gross differences observed in the placentas of smokers and non-smokers, Am J Epidemiol, 110, 178, 10.1093/oxfordjournals.aje.a112802 · DOI
  13. McNamara, 2014, Risk factors for high and low placental weight, Paediatr Perinat Epidemiol, 28, 97, 10.1111/ppe.12104 · DOI
  14. Macdonald, 2014, Obstetric conditions and the placental weight ratio, Placenta, 35, 582, 10.1016/j.placenta.2014.04.019 · DOI
  15. Wang, 2014, The effect of maternal prenatal smoking and alcohol consumption on the placenta-to-birth weight ratio, Placenta, 35, 437, 10.1016/j.placenta.2014.04.006 · DOI
  16. Godfrey, 1991, The effect of maternal anemia and iron deficiency on the ratio of fetal weight to placental weight, Br J Obstet Gynaecol, 98, 886, 10.1111/j.1471-0528.1991.tb13510.x · DOI
  17. Shehata, 2011, Placenta/birthweight ratio and perinatal outcome: a retrospective cohort analysis, BJOG, 118, 741, 10.1111/j.1471-0528.2011.02892.x · DOI
  18. Haavaldsen, 2013, Fetal death and placental weight/birthweight ratio: a population study, Acta Obstet Gynecol Scand, 92, 583, 10.1111/aogs.12105 · DOI
  19. Eskild, 2014, Placental weight and placental weight to birthweight ratio in relation to Apgar score at birth: a population study of 522 360 singleton pregnancies, Acta Obstet Gynecol Scand, 93, 1302, 10.1111/aogs.12509 · DOI
  20. MacArthur, 1988, Smoking in pregnancy: effects of stopping at different stages, Br J Obstet Gynaecol, 95, 551, 10.1111/j.1471-0528.1988.tb09481.x · DOI
  21. Irgens, 2000, The Medical Birth Registry of Norway. Epidemiological research and surveillance throughout 30 years, Acta Obstet Gynecol Scand, 79, 435, 10.1080/j.1600-0412.2000.079006435.x · DOI
  22. Thompson, 2007, Placenta weight percentile curves for singleton deliveries, BJOG, 114, 715, 10.1111/j.1471-0528.2007.01327.x · DOI
  23. Staff, 2014, Norsk gynekologisk forening [Norwegian Society for Gynaecology and Obstetrics
  24. Orsini, 2011, A procedure to tabulate and plot results after flexible modeling of a quantitative covariate, Stata J, 11, 1, 10.1177/1536867X1101100101 · DOI
  25. Grøtvedt, 2017, Development of social and demographic differences in maternal smoking between 1999 and 2014 in Norway, Nicotine Tob Res, 19, 539, 10.1093/ntr/ntw313 · DOI
  26. Eskild, 2013, Birthweight and placental weight; do changes in culture media used for IVF matter? Comparisons with spontaneous pregnancies in the corresponding time periods, Hum Reprod, 28, 3207, 10.1093/humrep/det376 · DOI
  27. Haavaldsen, 2011, The association of maternal age with placental weight: a population-based study of 536 954 pregnancies, BJOG, 118, 1470, 10.1111/j.1471-0528.2011.03053.x · DOI
  28. Wallace, 2013, Gestational age, gender and parity specific centile charts for placental weight for singleton deliveries in Aberdeen, UK, Placenta, 34, 269, 10.1016/j.placenta.2012.12.007 · DOI
  29. England, 2007, Smoking and risk of preeclampsia: a systematic review, Front Biosci, 12, 2471, 10.2741/2248 · DOI
  30. Eskild, 2009, Placental weight and birthweight: does the association differ between pregnancies with and without preeclampsia?, Am J Obstet Gynecol, 201, 595.e1., 10.1016/j.ajog.2009.06.003 · DOI
  31. Strøm-Roum, 2013, Placental weight relative to birthweight in pregnancies with maternal diabetes mellitus, Acta Obstet Gynecol Scand, 92, 783, 10.1111/aogs.12104 · DOI
  32. Sletner, 2015, Ethnic differences in fetal size and growth in a multi-ethnic population, Early Hum Dev, 91, 547, 10.1016/j.earlhumdev.2015.07.002 · DOI
  33. England, 2007, Misclassification of maternal smoking status and its effects on an epidemiologic study of pregnancy outcomes, Nicotine Tob Res, 9, 1005, 10.1080/14622200701491255 · DOI
  34. Nafstad, 1997, Hair nicotine concentrations in mothers and children in relation to parental smoking, J Expo Anal Environ Epidemiol, 7, 235
  35. Hlastala, 1976, Influence of carbon monoxide on hemoglobin-oxygen binding, J Appl Physiol, 41, 893, 10.1152/jappl.1976.41.6.893 · DOI
  36. Longo, 1976, Carbon monoxide: effects on oxygenation of the fetus in utero, Science, 194, 523, 10.1126/science.973133 · DOI
  37. Zdravkovic, 2005, The adverse effects of maternal smoking on the human placenta: a review, Placenta, 26, S81, 10.1016/j.placenta.2005.02.003 · DOI
  38. Pfarrer, 1999, Adaptive angiogenesis in placentas of heavy smokers, Lancet, 354, 303., 10.1016/S0140-6736(99)01676-1 · DOI
  39. Walsh, 1994, Effects of maternal smoking on adverse pregnancy outcomes: examination of the criteria of causation, Hum Biol, 66, 1059
  40. Yerushalmy, 1971, The relationship of parents’ cigarette smoking to the outcome of pregnancy—implications as to the problem of inferring causation from observed associations, Am J Epidemiol, 93, 443, 10.1093/oxfordjournals.aje.a121278 · DOI
  41. Hernandez-Diaz, 2006, The birthweight ‘paradox’ uncovered?, Am J Epidemiol, 164, 1115, 10.1093/aje/kwj275 · DOI
  42. VanderWeele, 2012, Conditioning on intermediates in perinatal epidemiology, Epidemiology, 23, 1, 10.1097/EDE.0b013e31823aca5d · DOI
  43. VanderWeele, 2014, Commentary: resolutions of the birthweight paradox: competing explanations and analytical insights, Int J Epidemiol, 43, 1368, 10.1093/ije/dyu162 · DOI
  44. Goldstein, 2017, Association of gestational weight gain with maternal and infant outcomes: a systematic review and meta-analysis, JAMA, 317, 2207, 10.1001/jama.2017.3635 · DOI
  45. Hulman, 2016, Are women who quit smoking at high risk of excess weight gain throughout pregnancy?, BMC Pregnancy Childbirth, 16, 263., 10.1186/s12884-016-1056-z · DOI
  46. James, 2006, The effects of oxygen concentration and gestational age on extravillous trophoblast outgrowth in a human first trimester villous explant model, Hum Reprod, 21, 2699, 10.1093/humrep/del212 · DOI
  47. Kadyrov, 1998, Increased fetoplacental angiogenesis during first trimester in anaemic women, Lancet, 352, 1747, 10.1016/S0140-6736(98)02069-8 · DOI

Cited by

Sorted by citations

See all 48

Metadata

Authors
Larsen, S., Haavaldsen, C., Bjelland, E. K., Dypvik, J., Jukic, A. M., & Eskild, A.
Affiliations
  • Department of Obstetrics and Gynecology, Akershus University Hospital, Lørenskog, Norway
  • Department of Chronic Disease Epidemiology, Yale School of Public Health, Yale University, New Haven, CT, USA
ORCID
Bjelland, Elisabeth Krefting
Venue
International Journal of Epidemiology
Publisher
Oxford University Press (OUP)
Published
2018-06-26
Volume
47
Issue
4
Pages
1141-1150
ISSN
  • 0300-5771
  • 1464-3685
DOI
10.1093/ije/dyy110
PMC
PMC6124614
Cited by
48
References
2
Language
en
Licence
creativecommons.org/licenses/by-nc/4.0/ (vor, 1 d)
Funders
South-Eastern Norway Regional Health Authority (2013003, 2014008, 2012001)

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review