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Background The aim of this study was to describe the contribution of prematurity and small for gestational age (SGA) to low birth weight (LBW) as well as to identify risk factors associated with preterm birth and SGA and to explore their impact on birth weight. Methods A cross-sectional study was carried out in southern Benin between June 2007 and July 2008. At delivery, women's characteristics and newborn's anthropometric measurements were collected. Gestational age was estimated using the Ballard method; SGA was defined using the William's reference curve. Analyses were performed by multiple logistic and linear regressions. Results In total, 526 mother–infant pairs were enrolled. LBW (<2500 g), prematurity (<37 weeks) and SGA accounted for 9.1%, 10.3% and 25.3% of the sample, respectively. Infant's male gender was associated with a lower risk of prematurity (p=0.03). Low maternal anthropometric status (p<0.001), primiparity (p=0.017) and infant's male gender (p=0.015) were associated with an increased risk of SGA. Only low maternal anthropometric status and primiparity were associated with an increased risk of LBW, and their effect on LBW was mediated by SGA. Conclusions SGA was the main mechanism mediating the effect of risk factors on LBW. Maternal undernutrition (either short stature or low anthropometric status) was the most important of them. [ABSTRACT FROM PUBLISHER]

Objective: To study obesity prevalence and associated factors in sedentary activity users at the Dantokpa market, Cotonou., Method: From October to November 2016, 460&#160;subjects were selected by stratified survey. Anthropometric data and information regarding knowledge and practices of the subjects related to obesity were collected by a questionnaire. The factors associated with obesity were researched by a logistic regression model., Results: The obesity prevalence was 35.7%. It was more predominant in women (P&#160;&lt;&#160;0.0001) and those aged between 38-57&#160;years (P&#160;&lt;&#160;0.0001). Insufficient or false knowledge and insufficient or bad practices concerning obesity cohabited among Dantokpa market sedentary users. The obesity associated factors were the sex (OR&#160;=&#160;2.3; P&#160;&lt; 0.006), the age of 38 to 57&#160;years (2.3; P&#160;=&#160;0.014), marital status (2.5; P&#160;=&#160;0.003), knowledge of physical incapacity as a consequence of obesity (1.8; P&#160;&lt;&#160;0.0001), daily sedentary duration between three and seven hours (18.0; P&#160;&lt;&#160;0.0001) and more than seven hours (85.1; P&#160;&lt;&#160;0.0001), family childbirth circumstances (1.9; P&#160;=&#160;0.002) revenue increasing circumstances (3.1; P&#160;=&#160;0.001) and sleep duration (2.01; P&#160;=&#160;0.003)., Conclusion: This study suggests the necessity for the implementation of strategies including notably physical activities and knowledge about obesity in order to reduce obesity prevalence in Dantokpa market sedentary activity users.