The correlates of provincial divorce rates in Germany in 1966 were marriage rates, birth rates, population density, and formerly East versus West Germany.
References
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LesterD. (1999) Regional differences in divorce rates, Journal of Divorce & Remarriage, 10, 121–124.
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LesterD. (2000) Explaining the regional variation of suicide in Germany, Suizidprophylaxe, 27(102), 68–69.