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Objectives
To investigate the risk profile of preterm birth (PTB) in 2018 in China.
Method
A prospective multicentre case–control study was conducted in 15 hospitals located in seven provinces throughout three geographical areas (the Eastern, South‐Central and North‐Western regions) in China. A total of 3147 preterm (<37+0 weeks) and 3147 term (37+0 to 41+6 weeks) live‐birth mothers were included...