The question to know how many and which are the constraints that predict whether a NP consisting of a noun and an adjective is one or two stress groups is still opened to debate, as is the question of how these constraints interact. The aim of this study is to evaluate the role of syntactic variables, metrics, realisational, lexical, idiolectal, social and stylistic weighing on the prosodic phrasing of NP consisting of an adjective and a noun in French. To this purpose, we conduct a regression analysis involving more than ten predictors and over 3 000 clusters extracted from 13 h-long corpus, sampled and annotated at various structural levels to address the question of regional speaking style variation in French. The results show that only the predictors related to metrical, realizational and speaking style factors are significant.