本研究展示了一项随机对照试验的结果，评估了共享书籍阅读(SBR)干预的影响，该干预针对的是生活在巴黎社会混合社区的4岁儿童。我们随机抽取了大量家庭样本，并为家长提供免费书籍、SBR益处的信息和有效阅读练习的技巧。我们测量了治疗儿童和对照组儿童在干预前后的SBR频率和儿童词汇量。干预对SBR频率有很大影响。在预测试中，41.2%的家庭每天都有SBR，治疗使这种做法提高了8个百分点。每周的SBR指数提高了14个百分点。干预只在低教育程度的家庭中促进了SBR的频率。这种均衡的影响是一个重要的发现，与之前的研究报告的背景相反，弱势家庭往往从SBR项目中受益较少。通过接受性词汇的标准化测试，这种干预还显著提高了儿童的语言技能。主要治疗效果的效应量在后测时为0.12，随访时为0.16。 Treatment effects are persistent six months after the end of the intervention. Children from low-educated and immigrant families improved their vocabulary as much as those from high-educated, native families. Moreover, the persisting positive impacts on vocabulary growth detected at the follow-up also involve children from disadvantaged families. Furthermore, these children more often attend schools with lower educational resources. It is therefore encouraging that the intervention has strong impacts in schools with initially low involvement in reading-related activities and with low educational resources.