The association between ambient temperature and preterm birth in Shenzhen, China: a distributed lag non-linear time series analysis

Environmental Health

Research

Yan Lin¹  Lei Zhang²  Yuli Cheng³  Xue Zhang⁴  Zhijiang Liang⁵  Qingguo Zhao⁵  Yuanzhu Ma⁵  Huazhang Miao⁵  Shaoqiang Zhang⁶  Li Li⁷  Xiaomei Zhou⁸  Hualiang Lin⁹ 

[1] Department of Children Health Care, Shenzhen Women and Children Hospital, Shenzhen, Guangdong, China;Department of Information Network, Meteorological Bureau of Shenzhen Municipality, Shenzhen, Guangdong, China;Department of Public Health, Bao An Maternal and Children Health Hospital, Shenzhen, Guangdong, China;Department of Public Health, Fu Tian Maternal and Children Health Hospital, Shenzhen, Guangdong, China;Department of Public Health, Guangdong Women And Children Hospital, 521, 523 Xing Nan Street, Panyu District, 511442, Guangzhou, Guangdong, China;Department of Public Health, Long Gang Maternal and Children Health Hospital, Shenzhen, Guangdong, China;Department of Public Health, Luo Hu Maternal and Children Health Hospital, Shenzhen, Guangdong, China;Fu Tian Hospital of TCM, Shenzhen, Guangdong, China;Guangdong Provincial Institute of Public Health, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, Guangdong, China;

关键词: Preterm birth;    Ambient temperature;    Time-series study;    Distributed lag non-linear model;   

DOI  :  10.1186/s12940-016-0166-4

 received in 2016-01-12, accepted in 2016-07-24,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundA few studies have examined the association between ambient temperature and preterm birth (PTB), and the results have been inconsistent. This study explored the association between ambient temperature and PTB in Shenzhen, China.MethodsData of daily singleton PTB, air pollution and meteorological variables from 2005 to 2011 were collected in Shenzhen. A distributed lag non-linear model (DLNM) was used to investigate the association of the low and high temperatures (1st, 5th, 95th, and 99th percentiles) with PTB.ResultsThe median temperature was 24.5 °C and the 1st, 5th, 95th, and 99th percentiles of daily mean temperatures were 9, 12.5, 29.9 and 30.7 °C, respectively. The prevalence of singleton PTB was 5.61 % in Shenzhen. The association between temperature and PTB was not linear. There was an immediate positive association of low temperature (1st and 5th percentiles) and a negative association of high temperature (95th and 99th percentiles) with PTB. The effect of low temperature 9 °C (1st) on PTB on the current day was stronger than that of 12.5 °C (5th), with a relative risk (RR) of 1.54 (95 % CI: 1.36–1.75) and 1.49 (95 % CI: 1.35–1.63), respectively. The cumulative RR (up to 30 days) of 9 and 12.5 °C was 1.72 (95 % CI: 1.28–2.33) and 1.96 (95 % CI: 1.60–2.39), respectively. The cumulative effects (up to 30 days) of high temperature (95th and 99th percentiles) on PTB were 0.69 (95 % CI: 0.60–0.80) and 0.62 (95 % CI: 0.52–0.74), respectively. The cumulative effect (up to 30 days) of low temperatures on vaginal delivery PTB was lower than that of the cesarean section PTB with an RR of 1.58 (95 % CI: 1.12–2.22) and 1.93 (95 % CI: 1.21–3.08), respectively.ConclusionsThis study suggests that low temperature might be a risk factor, while high temperature might be a protective factor of PTB in Shenzhen.

【 授权许可】

CC BY   
© The Author(s). 2016