Abstract:Objective To investigate the incidence of preterm birth and risk factors for preterm birth. Methods A prospective cohort study was performed for the pregnant women in early pregnancy and their spouses, who underwent prenatal examination for the first time in Hunan Provincial Maternal and Child Health Care Hospital from May 2014 to December 2016 and decided to be hospitalized for delivery. A questionnaire survey was performed to collect exposure information possibly related to preterm birth. The hospital's medical record system was used for information verification and to record the pregnancy outcome. A multivariate logistic regression analysis was used to investigate the risk factors for preterm birth. Results A total of 6 764 pregnant women with complete data were included, and the incidence rate of preterm birth was 17.09%. The multivariate logistic regression analysis showed that a history of adverse pregnancy outcomes, eating areca nut before pregnancy, a history of pregnancy complications, a history of hepatitis, no folate supplementation during pregnancy, medication during pregnancy, active smoking and passive smoking during pregnancy, drinking during pregnancy, unbalanced diet during pregnancy, high-intensity physical activity during pregnancy, and natural conception after treatment of infertility or assisted conception as the way of conception were risk factors for preterm birth (P<0.05). Additionally, the pregnant women whose spouses were older, had a higher body mass index or smoked had an increased risk for preterm birth (P<0.05). A higher level of education of pregnant women or their spouses and lower gravidity were protective factors against preterm birth (P<0.05). Conclusions There are many risk factors for preterm birth. Special attention should be paid to the life behaviors of pregnant women during pregnancy, and health education should be strengthened for pregnant women and their spouses to develop good living habits and reduce the incidence of preterm births.
1 World Health Organization. WHO recommendations on interventions to improve preterm birth outcomes[EB/OL].(2015-08-24)[2021-07-28].https://www.who.int/reproductivehealth/publications/maternal_perinatal_health/preterm-birth-guideline/en/.
Chawanpaiboon S, Vogel JP, Moller AB, et al. Global, regional, and national estimates of levels of preterm birth in 2014: a systematic review and modelling analysis[J]. Lancet Glob Health, 2019, 7(1): e37-e46. PMID: 30389451. PMCID: PMC6293055. DOI: 10.1016/S2214-109X(18)30451-0.
18 World Health Organization. International guide for monitoring alcohol consumption and related harm[EB/OL]. (2012-06-17)[2021-07-30]. https://apps.who.int/iris/handle/10665/66529.
21 Sj?str?m M, Ainsworth B, Bauman A, et al. Guidelines for data processing analysis of the International Physical Activity Questionnaire (IPAQ)-short and long forms[EB/OL]. [2021-07-31]. https://sites.google.com/site/theipaq/scoring-protocol.
Zhang J, Yu KF. What's the relative risk? A method of correcting the odds ratio in cohort studies of common outcomes[J]. JAMA, 1998, 280(19): 1690-1691. PMID: 9832001. DOI: 10.1001/jama.280.19.1690.
Hoyt AT, Canfield MA, Romitti PA, et al. Does maternal exposure to secondhand tobacco smoke during pregnancy increase the risk for preterm or small-for-gestational age birth?[J]. Matern Child Health J, 2018, 22(10): 1418-1429. PMID: 29574536. DOI: 10.1007/s10995-018-2522-1.
Henderson J, Gray R, Brocklehurst P. Systematic review of effects of low-moderate prenatal alcohol exposure on pregnancy outcome[J]. BJOG, 2007, 114(3): 243-252. PMID: 17233797. DOI: 10.1111/j.1471-0528.2006.01163.x.
O'Leary CM, Nassar N, Kurinczuk JJ, et al. Prenatal alcohol exposure and risk of birth defects[J]. Pediatrics, 2010, 126(4): e843-e850. PMID: 20876169. DOI: 10.1542/peds.2010-0256.
Lemmers M, Verschoor MAC, Hooker AB, et al. Dilatation and curettage increases the risk of subsequent preterm birth: a systematic review and meta-analysis[J]. Hum Reprod, 2016, 31(1): 34-45. PMID: 26534897. DOI: 10.1093/humrep/dev274.
Zhang Q, Wang YY, Xin XN, et al. Effect of folic acid supplementation on preterm delivery and small for gestational age births: a systematic review and meta-analysis[J]. Reprod Toxicol, 2017, 67: 35-41. PMID: 27856370. DOI: 10.1016/j.reprotox.2016.11.012.
Johnson WG, Scholl TO, Spychala JR, et al. Common dihydrofolate reductase 19-base pair deletion allele: a novel risk factor for preterm delivery[J]. Am J Clin Nutr, 2005, 81(3): 664-668. PMID: 15755837. DOI: 10.1093/ajcn/81.3.664.
Chen XK, Wen SW, Krewski D, et al. Paternal age and adverse birth outcomes: teenager or 40+, who is at risk?[J]. Hum Reprod, 2008, 23(6): 1290-1296. PMID: 18256111. DOI: 10.1093/humrep/dem403.
Hanif A, Ashraf T, Pervaiz MK, et al. Prevalence and risk factors of preterm birth in Pakistan[J]. J Pak Med Assoc, 2020, 70(4): 577-582. PMID: 32296198. DOI: 10.5455/JPMA.295022.
Oldereid NB, Wennerholm UB, Pinborg A, et al. The effect of paternal factors on perinatal and paediatric outcomes: a systematic review and meta-analysis[J]. Hum Reprod Update, 2018, 24(3): 320-389. PMID: 29471389. DOI: 10.1093/humupd/dmy005.
Mutsaerts MAQ, Groen H, Buiter-Van der Meer A, et al. Effects of paternal and maternal lifestyle factors on pregnancy complications and perinatal outcome. A population-based birth-cohort study: the GECKO Drenthe cohort[J]. Hum Reprod, 2014, 29(4): 824-834. PMID: 24510962. DOI: 10.1093/humrep/deu006.
Deng K, Liu Z, Lin Y, et al. Periconceptional paternal smoking and the risk of congenital heart defects: a case-control study[J]. Birth Defects Res A Clin Mol Teratol, 2013, 97(4): 210-216. PMID: 23554276. DOI: 10.1002/bdra.23128.