The construct state is used when a noun becomes unstressed as the first element of a compound, whereas the pronominal state is used when the noun has a suffixed possessive pronoun.
ðə kˈɑːnstɹʌkt stˈeɪt ɪz jˈuːzd wɛn ɐ nˈaʊn bɪkˌʌmz ʌnstɹˈɛst æz ðə fˈɜːst ˈɛlɪmənt əvə kˈɑːmpaʊnd, wˈɛɹæz ðə pɹənˈɑːmɪnəl stˈeɪt ɪz jˈuːzd wɛn ðə nˈaʊn hɐz ɐ sˈʌfɪkst pəzˈɛsɪv pɹˈoʊnaʊn.