There was a decline in consanguineous marriage rates in Lebanon between 1950 and 1970, from an overall rate of ca. 30% down to 20%.[1]

There has been an increase in consanguineous marriage rates since 1983-84 when the overall rate was 25%[2] to the 2000s (2008?) when the overall rate was 35.5%[3].

Reportedly, there has also been an increase in the wearing of headscarves in this period, i.e. since the 1980s:

The wearing of headscarves has risen since the 1980s, even though Lebanon is generally more liberal than other Mideast countries and also has larger Christian and secular communities. Women who support Hezbollah, the Shiite militant group, wear headscarves generally and some wear the Iranian-style chador, which covers the hair and body but not the face or hands.[4]

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[1] Parental consanguinity and congenital heart malformations in a developing country

[2] Consanguineous Marriage and Reproduction in Beirut, Lebanon

[3] Consanguinity in Lebanon: prevalence, distribution and determinants

[4] A Look At The Wearing Of Veils Across The Muslim World, International Herald Tribune, Oct 31, 2006.