The maternal factors associated with infant low birth weight: an umbrella review.
Low birth weight
Maternal factors
Periodontal disease
Umbrella review
Journal
BMC pregnancy and childbirth
ISSN: 1471-2393
Titre abrégé: BMC Pregnancy Childbirth
Pays: England
ID NLM: 100967799
Informations de publication
Date de publication:
25 Apr 2024
25 Apr 2024
Historique:
received:
15
11
2023
accepted:
05
04
2024
medline:
26
4
2024
pubmed:
26
4
2024
entrez:
25
4
2024
Statut:
epublish
Résumé
In this umbrella review, we systematically evaluated the evidence from meta-analyses and systematic reviews of maternal factors associated with low birth weight. PubMed, Scopus, and Web of Science were searched to identify all relevant published studies up to August 2023. We included all meta-analysis studies (based on cohort, case-control, cross-sectional studies) that examined the association between maternal factors (15 risk factors) and risk of LBW, regardless of publication date. A random-effects meta-analysis was conducted to estimate the summary effect size along with the 95% confidence interval (CI), 95% prediction interval, and heterogeneity (I We included 13 systematic Review with 15 meta-analysis studies in our study based on the inclusion criteria. The following 13 maternal factors were identified as risk factors for low birth weight: crack/cocaine (odds ratio [OR] 2.82, 95% confidence interval [CI] 2.26-3.52), infertility (OR 1.34, 95% CI 1.2-1.48), smoking (OR 2.00, 95% CI 1.76-2.28), periodontal disease (OR 2.41, 95% CI 1.67-3.47), depression (OR 1.84, 95% CI 1.34-2.53), anemia (OR 1.32, 95% CI 1.13-1.55), caffeine/coffee (OR 1.34, 95% CI 1.14-1.57), heavy physical workload (OR 1.87, 95% CI 1.00-3.47), lifting ≥ 11 kg (OR 1.59, 95% CI 1.02-2.48), underweight (OR 1.79, 95% CI 1.20-2.67), alcohol (OR 1.23, 95% CI 1.04-1.46), hypertension (OR 3.90, 95% CI 2.73-5.58), and hypothyroidism (OR 1.40, 95% CI 1.01-1.94). A significant negative association was also reported between antenatal care and low birth weight. This umbrella review identified drug use (such as crack/cocaine), infertility, smoking, periodontal disease, depression, caffeine and anemia as risk factors for low birth weight in pregnant women. These findings suggest that pregnant women can reduce the risk of low birth weight by maintaining good oral health, eating a healthy diet, managing stress and mental health, and avoiding smoking and drug use.
Sections du résumé
BACKGROUND
BACKGROUND
In this umbrella review, we systematically evaluated the evidence from meta-analyses and systematic reviews of maternal factors associated with low birth weight.
METHODS
METHODS
PubMed, Scopus, and Web of Science were searched to identify all relevant published studies up to August 2023. We included all meta-analysis studies (based on cohort, case-control, cross-sectional studies) that examined the association between maternal factors (15 risk factors) and risk of LBW, regardless of publication date. A random-effects meta-analysis was conducted to estimate the summary effect size along with the 95% confidence interval (CI), 95% prediction interval, and heterogeneity (I
RESULTS
RESULTS
We included 13 systematic Review with 15 meta-analysis studies in our study based on the inclusion criteria. The following 13 maternal factors were identified as risk factors for low birth weight: crack/cocaine (odds ratio [OR] 2.82, 95% confidence interval [CI] 2.26-3.52), infertility (OR 1.34, 95% CI 1.2-1.48), smoking (OR 2.00, 95% CI 1.76-2.28), periodontal disease (OR 2.41, 95% CI 1.67-3.47), depression (OR 1.84, 95% CI 1.34-2.53), anemia (OR 1.32, 95% CI 1.13-1.55), caffeine/coffee (OR 1.34, 95% CI 1.14-1.57), heavy physical workload (OR 1.87, 95% CI 1.00-3.47), lifting ≥ 11 kg (OR 1.59, 95% CI 1.02-2.48), underweight (OR 1.79, 95% CI 1.20-2.67), alcohol (OR 1.23, 95% CI 1.04-1.46), hypertension (OR 3.90, 95% CI 2.73-5.58), and hypothyroidism (OR 1.40, 95% CI 1.01-1.94). A significant negative association was also reported between antenatal care and low birth weight.
CONCLUSIONS
CONCLUSIONS
This umbrella review identified drug use (such as crack/cocaine), infertility, smoking, periodontal disease, depression, caffeine and anemia as risk factors for low birth weight in pregnant women. These findings suggest that pregnant women can reduce the risk of low birth weight by maintaining good oral health, eating a healthy diet, managing stress and mental health, and avoiding smoking and drug use.
Identifiants
pubmed: 38664680
doi: 10.1186/s12884-024-06487-y
pii: 10.1186/s12884-024-06487-y
doi:
Types de publication
Journal Article
Systematic Review
Langues
eng
Sous-ensembles de citation
IM
Pagination
316Informations de copyright
© 2024. The Author(s).
Références
Fite MB, Tura AK, Yadeta TA, Oljira L, Roba KT. Prevalence, predictors of low birth weight and its association with maternal iron status using serum ferritin concentration in rural Eastern Ethiopia: a prospective cohort study. BMC Nutr. 2022;8(1):1–10.
doi: 10.1186/s40795-022-00561-4
Gupta MK, Kakkar M, Sethi C, Malhotra A. Pattern of morbidity and mortality in LBW neonates: a study from Jaipur. J Evol Med Dent Sci. 2014;3(6):1339–45.
doi: 10.14260/jemds/2014/1989
Lin S, Li J, Wu J, Yang F, Pei L, Shang X. Interactive effects of maternal exposure to chemical fertilizer and socio-economic status on the risk of low birth weight. BMC Public Health. 2022;22(1):1206.
pubmed: 35710359
pmcid: 9204990
doi: 10.1186/s12889-022-13604-z
Ramankutty P, TIKREETI RAS, RASAAM KW, AL-THAMERY DM, YACOUB AA, MAHMOOD DA. A study on birth weight of Iraqi children. J Trop Pediatr. 1983;29(1):5–10.
pubmed: 6834462
doi: 10.1093/tropej/29.1.5
Williams RL, Creasy RK, Cunningham GC, Hawes WE, Norris FD, Tashiro M. Fetal growth and perinatal viability in California. Obstet Gynecol. 1982;59(5):624–32.
pubmed: 7070736
Yilgwan C, Abok I, Yinnang W, Vajime B. Prevalence and risk factors of low birth weight in Jos. Jos J Med. 2009;4(1):13–5.
Gebregzabiherher Y, Haftu A, Weldemariam S, Gebrehiwet H. The prevalence and risk factors for low birth weight among term newborns in Adwa General Hospital, Northern Ethiopia. Obstetrics and Gynecology International. 2017;2017.
Oluwafemi RO, Adesina FP, Hassan AO. Outcomes and Disease Spectrum of LBW neonates in a secondary health facility. J Healthc Eng. 2022;2022:9974636.
pubmed: 35126962
pmcid: 8813240
doi: 10.1155/2022/9974636
Endalamaw A, Engeda EH, Ekubagewargies DT, Belay GM, Tefera MA. Low birth weight and its associated factors in Ethiopia: a systematic review and meta-analysis. Ital J Pediatr. 2018;44(1):1–12.
doi: 10.1186/s13052-018-0586-6
Sema A, Tesfaye F, Belay Y, Amsalu B, Bekele D, Desalew A. Associated factors with low birth weight in Dire Dawa City, Eastern Ethiopia: a cross-sectional study. BioMed research international. 2019;2019.
Upadhyay RP, Taneja S, Ranjitkar S, Mazumder S, Bhandari N, Dua T, et al. Factors determining cognitive, motor and language scores in low birth weight infants from North India. PLoS ONE. 2021;16(5):e0251387.
pubmed: 33979366
pmcid: 8115769
doi: 10.1371/journal.pone.0251387
Louis B, Steven B, Margret N, Ronald N, Emmanuel L, Tadeo N, et al. Prevalence and factors associated with low birth weight among teenage mothers in new Mulago hospital: a cross sectional study. J Health Sci (El Monte). 2016;4:192.
pubmed: 29359171
Khan MMA, Mustagir MG, Islam MR, Kaikobad MS, Khan HT. Exploring the association between adverse maternal circumstances and low birth weight in neonates: a nationwide population-based study in Bangladesh. BMJ open. 2020;10(10):e036162.
pubmed: 33109640
pmcid: 7592295
doi: 10.1136/bmjopen-2019-036162
Viengsakhone L, Yoshida Y, Harun-Or-Rashid M, Sakamoto J. Factors affecting low birth weight at four central hospitals in vientiane, Lao PDR. Nagoya J Med Sci. 2010;72(1–2):51–8.
pubmed: 20229703
Pereira PPS, Da Mata FA, Figueiredo ACG, de Andrade KRC, Pereira MG. Maternal active smoking during pregnancy and low birth weight in the Americas: a systematic review and meta-analysis. Nicotine Tob Res. 2017;19(5):497–505.
pubmed: 28403455
doi: 10.1093/ntr/ntw228
Xiong X, Buekens P, Vastardis S, Stella MY. Periodontal disease and pregnancy outcomes: state-of-the-science. Obstet Gynecol Surv. 2007;62(9):605–15.
pubmed: 17705886
doi: 10.1097/01.ogx.0000279292.63435.40
Marvin-Dowle K, Soltani H. A comparison of neonatal outcomes between adolescent and adult mothers in developed countries: a systematic review and meta-analysis. Eur J Obstet Gynecol Reproductive Biology: X. 2020;6:100109.
doi: 10.1016/j.eurox.2020.100109
Patra J, Bakker R, Irving H, Jaddoe VW, Malini S, Rehm J. Dose–response relationship between alcohol consumption before and during pregnancy and the risks of low birthweight, preterm birth and small for gestational age (SGA)—a systematic review and meta-analyses. BJOG: Int J Obstet Gynecol. 2011;118(12):1411–21.
doi: 10.1111/j.1471-0528.2011.03050.x
Hulse G, English D, Milne E, Holman C, Bower C. Maternal cocaine use and low birth weight newborns: a meta-analysis. Addiction. 1997;92(11):1561–70.
pubmed: 9519498
doi: 10.1111/j.1360-0443.1997.tb02876.x
Haider BA, Olofin I, Wang M, Spiegelman D, Ezzati M, Fawzi WW. Anaemia, prenatal iron use, and risk of adverse pregnancy outcomes: systematic review and meta-analysis. BMJ (Clinical Res ed). 2013;346.
Accortt EE, Cheadle AC, Dunkel Schetter C. Prenatal depression and adverse birth outcomes: an updated systematic review. Matern Child Health J. 2015;19:1306–37.
pubmed: 25452215
pmcid: 4447551
doi: 10.1007/s10995-014-1637-2
Bian Y, Zhang Z, Liu Q, Wu D, Wang S. Maternal risk factors for low birth weight for term births in a developed region in China: a hospital-based study of 55,633 pregnancies. J Biomedical Res. 2013;27(1):14.
doi: 10.7555/JBR.27.20120046
Murphy CC, Schei B, Myhr TL, Du Mont J. Abuse: a risk factor for low birth weight? A systematic review and meta-analysis. CMAJ. 2001;164(11):1567–72.
pubmed: 11402794
pmcid: 81110
Shamseer L, Moher D, Clarke M, Ghersi D, Liberati A, Petticrew M et al. Preferred reporting items for systematic review and meta-analysis protocols (PRISMA-P) 2015: elaboration and explanation. BMJ (Clinical research ed). 2015;349.
Shea BJ, Reeves BC, Wells G, Thuku M, Hamel C, Moran J et al. AMSTAR 2: a critical appraisal tool for systematic reviews that include randomised or non-randomised studies of healthcare interventions, or both. BMJ. 2017;358.
Cochran WG. The combination of estimates from different experiments. Biometrics. 1954;10(1):101–29.
doi: 10.2307/3001666
Riley RD, Higgins JP, Deeks JJ. Interpretation of random effects meta-analyses. BMJ (Clinical Res ed). 2011;342.
Egger M, Smith GD, Schneider M, Minder C. Bias in meta-analysis detected by a simple, graphical test. BMJ (Clinical Res ed). 1997;315(7109):629–34.
doi: 10.1136/bmj.315.7109.629
Ioannidis JP, Trikalinos TA. An exploratory test for an excess of significant findings. Clin Trails. 2007;4(3):245–53.
doi: 10.1177/1740774507079441
Hedges LV, Olkin I. Statistical methods for meta-analysis. Academic; 2014.
Cohen J. The t Test for Means. I Statistical Power Analysis for the Behavioral Sciences (2. utg., s. 19–74). New York: Routledge; 1977.
Zhang Y, Feng W, Li J, Cui L, Chen ZJ. Periodontal Disease and adverse neonatal outcomes: a systematic review and Meta-analysis. Front Pead. 2022;10.
Rahman MM, Abe SK, Rahman MS, Kanda M, Narita S, Bilano V, et al. Maternal anemia and risk of adverse birth and health outcomes in low- and middle-income countries: systematic review and meta-analysis. Am J Clin Nutr. 2016;103(2):495–504.
pubmed: 26739036
doi: 10.3945/ajcn.115.107896
Pereira PPS, Da Mata FAF, Figueiredo ACG, de Andrade KRC, Pereira MG. Maternal active smoking during pregnancy and low birth weight in the americas: a systematic review and meta-analysis. Nicotine Tob Res. 2017;19(5):497–505.
pubmed: 28403455
doi: 10.1093/ntr/ntw228
Pereira P, Mata F, Figueiredo A, Silva RB, Pereira MG. Maternal exposure to Alcohol and low birthweight: a systematic review and Meta-analysis. Revista Brasileira De Ginecol E Obstetricia: Revista da Federacao Brasileira das Sociedades de Ginecol E Obstet. 2019;41(5):333–47.
doi: 10.1055/s-0039-1688905
Messerlian C, Maclagan L, Basso O. Infertility and the risk of adverse pregnancy outcomes: a systematic review and meta-analysis. Hum Reprod (Oxford England). 2013;28(1):125–37.
doi: 10.1093/humrep/des347
Liu L, Ma Y, Wang N, Lin W, Liu Y, Wen D. Maternal body mass index and risk of neonatal adverse outcomes in China: a systematic review and meta-analysis. BMC Pregnancy Childbirth. 2019;19(1):105.
pubmed: 30922244
pmcid: 6440121
doi: 10.1186/s12884-019-2249-z
Jin F, Qiao C. Association of maternal caffeine intake during pregnancy with low birth weight, childhood overweight, and obesity: a meta-analysis of cohort studies. International journal of obesity (2005). 2021;45(2):279 – 87.
Hou J, Yu P, Zhu H, Pan H, Li N, Yang H, et al. The impact of maternal hypothyroidism during pregnancy on neonatal outcomes: a systematic review and meta-analysis. Gynecol Endocrinology: Official J Int Soc Gynecol Endocrinol. 2016;32(1):9–13.
doi: 10.3109/09513590.2015.1104296
Ghimire U, Papabathini SS, Kawuki J, Obore N, Musa TH. Depression during pregnancy and the risk of low birth weight, preterm birth and intrauterine growth restriction- an updated meta-analysis. Early Hum Dev. 2021;152:105243.
pubmed: 33190020
doi: 10.1016/j.earlhumdev.2020.105243
Getaneh T, Negesse A, Dessie G, Desta M. The impact of pregnancy induced hypertension on low birth weight in Ethiopia: systematic review and meta-analysis. Ital J Pediatr. 2020;46(1):174.
pubmed: 33243285
pmcid: 7690116
doi: 10.1186/s13052-020-00926-0
Dos Santos JF, de Melo Bastos Cavalcante C, Barbosa FT, Gitaí DLG, Duzzioni M, Tilelli CQ, et al. Maternal, fetal and neonatal consequences associated with the use of crack cocaine during the gestational period: a systematic review and meta-analysis. Arch Gynecol Obstet. 2018;298(3):487–503.
pubmed: 29951712
doi: 10.1007/s00404-018-4833-2
Cai C, Vandermeer B, Khurana R, Nerenberg K, Featherstone R, Sebastianski M, et al. The impact of occupational activities during pregnancy on pregnancy outcomes: a systematic review and meta-analysis. Am J Obstet Gynecol. 2020;222(3):224–38.
pubmed: 31550447
doi: 10.1016/j.ajog.2019.08.059
Engdaw GT, Tesfaye AH, Feleke M, Negash A, Yeshiwas A, Addis W, et al. Effect of antenatal care on low birth weight: a systematic review and meta-analysis in Africa, 2022. Front Public Health. 2023;11:1158809.
pubmed: 37441651
pmcid: 10335749
doi: 10.3389/fpubh.2023.1158809
Fonseca J, Silva A, Rocha P, Batista R, Thomaz E, Lamy-Filho F et al. Racial inequality in perinatal outcomes in two Brazilian birth cohorts. Braz J Med Biol Res. 2021;54.
Cunningham SD, Lewis JB, Shebl FM, Boyd LM, Robinson MA, Grilo SA, et al. Group prenatal care reduces risk of preterm birth and low birth weight: a matched cohort study. J Women’s Health. 2019;28(1):17–22.
doi: 10.1089/jwh.2017.6817
Ghimire PR, Agho KE, Akombi BJ, Wali N, Dibley M, Raynes-Greenow C, et al. Perinatal mortality in South Asia: systematic review of observational studies. Int J Environ Res Public Health. 2018;15(7):1428.
pubmed: 29986453
pmcid: 6069066
doi: 10.3390/ijerph15071428
Basso O, Baird DD. Infertility and preterm delivery, birthweight, and caesarean section: a study within the Danish National Birth Cohort. Hum Reprod. 2003;18(11):2478–84.
pubmed: 14585905
doi: 10.1093/humrep/deg444
Thomson F, Shanbhag S, Templeton A, Bhattacharya S. Obstetric outcome in women with subfertility. BJOG: Int J Obstet Gynecol. 2005;112(5):632–7.
doi: 10.1111/j.1471-0528.2004.00489.x
McDonald SD, Han Z, Mulla S, Ohlsson A, Beyene J, Murphy KE, et al. Preterm birth and low birth weight among in vitro fertilization twins: a systematic review and meta-analyses. Eur J Obstet Gynecol Reproductive Biology. 2010;148(2):105–13.
doi: 10.1016/j.ejogrb.2009.09.019
Saunders D, Mathews M, Lancaster P. The Australian Register: current research and future role a: a preliminary Report. Ann N Y Acad Sci. 1988;541(1):7–21.
pubmed: 3195947
doi: 10.1111/j.1749-6632.1988.tb22237.x
Tan S-L, Doyle P, Campbell S, Beral V, Rizk B, Brinsden P, et al. Obstetric outcome of in vitro fertilization pregnancies compared with normally conceived pregnancies. Am J Obstet Gynecol. 1992;167(3):778–84.
pubmed: 1530039
doi: 10.1016/S0002-9378(11)91589-0
Jauniaux E, Burton GJ. Morphological and biological effects of maternal exposure to tobacco smoke on the fetoplacental unit. Early Hum Dev. 2007;83(11):699–706.
pubmed: 17900829
doi: 10.1016/j.earlhumdev.2007.07.016
Ko T-J, Tsai L-Y, Chu L-C, Yeh S-J, Leung C, Chen C-Y, et al. Parental smoking during pregnancy and its association with low birth weight, small for gestational age, and preterm birth offspring: a birth cohort study. Pediatr Neonatology. 2014;55(1):20–7.
doi: 10.1016/j.pedneo.2013.05.005
Chiolero A, Bovet P, Paccaud F. Association between maternal smoking and low birth weight in Switzerland: the EDEN study. Swiss Med Wkly. 2005;135(35–36):525–30.
pubmed: 16323070
Wang N, Tikellis G, Sun C, Pezic A, Wang L, Wells JC, et al. The effect of maternal prenatal smoking and alcohol consumption on the placenta-to-birth weight ratio. Placenta. 2014;35(7):437–41.
pubmed: 24816479
pmcid: 4096564
doi: 10.1016/j.placenta.2014.04.006
Lambers DS, Clark KE, editors. The maternal and fetal physiologic effects of nicotine. Seminars in perinatology. Elsevier; 1996.
Borges G, Lopez-Cervantes M, Medina-Mora ME, Tapia-Conyer R, Garrido F. Alcohol consumption, low birth weight, and preterm delivery in the National Addiction Survey (Mexico). Int J Addictions. 1993;28(4):355–68.
doi: 10.3109/10826089309039633
Sprauve ME, Lindsay MK, Herbert S, Graves W. Adverse perinatal outcome in parturients who use crack cocaine. Obstet Gynecol. 1997;89(5):674–8.
pubmed: 9166299
doi: 10.1016/S0029-7844(97)00078-1
Chen L-W, Wu Y, Neelakantan N, Chong MF-F, Pan A, van Dam RM. Maternal caffeine intake during pregnancy is associated with risk of low birth weight: a systematic review and dose-response meta-analysis. BMC Med. 2014;12(1):1–12.
doi: 10.1186/s12916-014-0174-6
Chen LW, Wu Y, Neelakantan N, Chong MF, Pan A, van Dam RM. Maternal caffeine intake during pregnancy is associated with risk of low birth weight: a systematic review and dose-response meta-analysis. BMC Med. 2014;12:174.
pubmed: 25238871
pmcid: 4198801
doi: 10.1186/s12916-014-0174-6
Rhee J, Kim R, Kim Y, Tam M, Lai Y, Keum N, et al. Maternal caffeine consumption during pregnancy and risk of low Birth Weight: a dose-response Meta-analysis of Observational studies. PLoS ONE. 2015;10(7):e0132334.
pubmed: 26193706
pmcid: 4507998
doi: 10.1371/journal.pone.0132334
Greenwood DC, Thatcher NJ, Ye J, Garrard L, Keogh G, King LG, et al. Caffeine intake during pregnancy and adverse birth outcomes: a systematic review and dose-response meta-analysis. Eur J Epidemiol. 2014;29(10):725–34.
pubmed: 25179792
doi: 10.1007/s10654-014-9944-x
Rahman LA, Hairi NN, Salleh N. Association between pregnancy induced hypertension and low birth weight; a population based case-control study. Asia Pac J Public Health. 2008;20(2):152–8.
pubmed: 19124309
doi: 10.1177/1010539507311553
Bilano VL, Ota E, Ganchimeg T, Mori R, Souza JP. Risk factors of pre-eclampsia/eclampsia and its adverse outcomes in low-and middle-income countries: a WHO secondary analysis. PLoS ONE. 2014;9(3):e91198.
pubmed: 24657964
pmcid: 3962376
doi: 10.1371/journal.pone.0091198
Li F, Wang T, Chen L, Zhang S, Chen L, Qin J. Adverse pregnancy outcomes among mothers with hypertensive disorders in pregnancy: a meta-analysis of cohort studies. Pregnancy Hypertens. 2021;24:107–17.
pubmed: 33813363
doi: 10.1016/j.preghy.2021.03.001
Rahman A, Bunn J, Lovel H, Creed F. Association between antenatal depression and low birthweight in a developing country. Acta Psychiatrica Scandinavica. 2007;115(6):481–6.
pubmed: 17498160
pmcid: 1974771
doi: 10.1111/j.1600-0447.2006.00950.x
Rahmati S, Delpishe A, Azami M, Ahmadi MRH, Sayehmiri K. Maternal Anemia during pregnancy and infant low birth weight: a systematic review and Meta-analysis. Int J Reproductive Biomed. 2017;15(3):125.
doi: 10.29252/ijrm.15.3.125
Cetin I, Pileri P, Villa A, Calabrese S, Ottolenghi L, Abati S. Pathogenic mechanisms linking periodontal diseases with adverse pregnancy outcomes. Reproductive Sci. 2012;19(6):633–41.
doi: 10.1177/1933719111432871
Komine-Aizawa S, Aizawa S, Hayakawa S. Periodontal diseases and adverse pregnancy outcomes. J Obstet Gynecol Res. 2019;45(1):5–12.
doi: 10.1111/jog.13782
Saddki N, Bachok Na, Hussain NHN, Zainudin SLA, Sosroseno W. The association between maternal periodontitis and low birth weight infants among malay women. Commun Dent Oral Epidemiol. 2008;36(4):296–304.
doi: 10.1111/j.1600-0528.2007.00383.x
Souza LM, Cruz SSd, Gomes-Filho IS, Barreto ML, Passos-Soares JS, Trindade SC, et al. Effect of maternal periodontitis and low birth weight—A case control study. Acta Odontol Scand. 2016;74(1):73–80.
pubmed: 26018844
doi: 10.3109/00016357.2015.1049374
Derakhshan A, Peeters RP, Taylor PN, Bliddal S, Carty DM, Meems M, et al. Association of maternal thyroid function with birthweight: a systematic review and individual-participant data meta-analysis. Lancet Diabetes Endocrinol. 2020;8(6):501–10.
pubmed: 32445737
pmcid: 8168324
doi: 10.1016/S2213-8587(20)30061-9
Knudsen IR, Bonde JP, Petersen SB. Physically strenuous work during pregnancy and risk of preterm birth. Arch Environ Occup Health. 2018;73(4):236–42.
pubmed: 28622105
doi: 10.1080/19338244.2017.1342589
Kramer MS, McDonald SW. Aerobic exercise for women during pregnancy. Cochrane database of systematic reviews. 2006(3).
Palmer KT, Bonzini M, Harris EC, Linaker C, Bonde JP. Work activities and risk of prematurity, low birth weight and pre-eclampsia: an updated review with meta-analysis. Occup Environ Med. 2013;70(4):213–22.
pubmed: 23343859
doi: 10.1136/oemed-2012-101032
Cai C, Vandermeer B, Khurana R, Nerenberg K, Featherstone R, Sebastianski M, et al. The impact of occupational shift work and working hours during pregnancy on health outcomes: a systematic review and meta-analysis. Am J Obstet Gynecol. 2019;221(6):563–76.
pubmed: 31276631
doi: 10.1016/j.ajog.2019.06.051
Liu X, Du J, Wang G, Chen Z, Wang W, Xi Q. Effect of pre-pregnancy body mass index on adverse pregnancy outcome in north of China. Arch Gynecol Obstet. 2011;283:65–70.
pubmed: 21197595
doi: 10.1007/s00404-009-1288-5
Chen Z, Du J, Shao L, Zheng L, Wu M, Ai M, et al. Prepregnancy body mass index, gestational weight gain, and pregnancy outcomes in China. Int J Gynecol Obstet. 2010;109(1):41–4.
doi: 10.1016/j.ijgo.2009.10.015
Kumar A, Chaudhary K, Prasad S. Maternal indicators and obstetric outcome in the north Indian population: a hospital-based study. J Postgrad Med. 2010;56(3):192.
pubmed: 20739764
doi: 10.4103/0022-3859.68647
Rahman MM, Abe SK, Kanda M, Narita S, Rahman MS, Bilano V, et al. Maternal body mass index and risk of birth and maternal health outcomes in low- and middle-income countries: a systematic review and meta-analysis. Obes Rev. 2015;16(9):758–70.
pubmed: 26094567
doi: 10.1111/obr.12293
Han Z, Mulla S, Beyene J, Liao G, McDonald SD. Maternal underweight and the risk of preterm birth and low birth weight: a systematic review and meta-analyses. Int J Epidemiol. 2011;40(1):65–101.
pubmed: 21097954
doi: 10.1093/ije/dyq195
Becher L, Thomson D, Caldwell D, editors. Addressing multiple treatments I: Cochrane Overviews. Basic Workshops; 2009.
Grant MJ, Booth A. A typology of reviews: an analysis of 14 review types and associated methodologies. Health Inf Libr J. 2009;26(2):91–108.
doi: 10.1111/j.1471-1842.2009.00848.x
Booth A. EVIDENT Guidance for reviewing the evidence: a compendium of methodological literature and websites. Volume 13. Sheffield: University of Sheffield; 2016.