From the Egypt Demographic and Health Survey 2005:

Total consanguineous marriages = 32.2%
Total first cousin marriages = 17.5%; inbreeding coefficient = 0.0109
Total second cousin marriages = 7.3%; inbreeding coefficient = 0.0011
Total “other blood relative” marriages = 7.4%

Total FBD marriages = 11%; inbreeding coefficient = 0.0069

Urban consanguineous marriages = 24%
Rural consanguineous marriages = 37.9%

Urban 1C = 13%; inbreeding coefficient = 0.0081
Urban 2C = 6%; inbreeding coefficient = 0.0009
Rural 1C = 20.6%; inbreeding coefficient = 0.0129
Rural 2C = 8.3%; inbreeding coefficient = 0.0013

Urban Governorates = 22.5%
Lower Egypt urban = 19.4%
Lower Egypt rural = 29%
Upper Egypt urban = 29.4%
Upper Egypt rural = 48.5%
Frontier Governorates = 41.4%

Urban Governorates = Cairo, Alexandria, Port Said, and Suez (no rural population)
Lower Egypt = 9 Lower Egypt governorates totally (Nile Delta)
Upper Egypt = 8 Upper Egypt governorates totally (Nile Valley)
Frontier Governorates = 5 governorates on eastern/western boundaries

Collection period: 2005
Study population: A nationally representative sample of ever-married women aged 15-49.
Sample size: 19,474
Location: Nation-wide.

Advertisements

From A genetic epidemiological study of malformations at birth in Egypt:

“Parental consanguinity was found in 31.79% of all cases….”

Total consanguinity rate = 31.79%

Collection period: 1991-93
Study population: Obstetric inpatients
Sample size: 80
Location: Boulak El-Dakrour Hospital in Giza; serves both urban and rural patients. Giza Governorate is one of the Delta/Lower Egypt Governorates.

~ ~ ~ ~ ~

Compare:

1991-93 Giza = 31.79%
2000 Lower Egypt = 33.3%
2008 Lower Egypt = 23.4%
2009/10(?) Dakahlia = 19.8%

From Consanguinity and increased risk for schizophrenia in Egypt:

“3.4. Consanguinity by area of residence – Individuals living in villages or small towns (population less than 10,000)were classified as rural dwellers (65% of cases and 73% of controls), while the remainder were considered urban residents. The rates of self-reported consanguinity were similar among cases (36.11% among rural and 38.10% among urban groups) and controls from both groups (17.14% among rural and 20% among the urban control groups).”

Total consanguinity rate = 19.8%

Urban consanguinity rate = 20%
Rural consanguinity rate = 17.14%
(Reversed?)

1C consanguinity rate = 7.9%; inbreeding coefficient = 0.0049
<1C consanguinity rate = 11.9%

Collection period: unknown; 2009/10(?)
Study population: psychiatric outpatients plus controls.
Sample size: 201
Location: Mansoura, Dakahlia Governorate – one of the Lower Egypt/Delta Governorates

~ ~ ~ ~ ~

Compare:

2000 Lower Egypt = 33.3%
2008 Lower Egypt = 23.4%
2009/10(?) Dakahlia = 19.8%

2000 Lower Egypt urban = 25.2%
2008 Lower Egypt urban = 18%
2009/10(?) Dakahlia urban = 20%

2000 Lower Egypt rural = 36.6%
2008 Lower Egypt rural = 25.3%
2009/10(?) Dakahlia rural = 17.14%

2000 Lower Egypt 1C consanguinity rate = 20.7%
2008 Lower Egypt 1C consanguinity rate = 13%
2009/10(?) Dakahlia 1C consanguinity rate = 7.9%

From Congenital malformations: a report of a study of series of consecutive births in 24 centres:

Total consanguinity rate = 32.8% (>1C,1C,<1C)

Collection period: 1961-64
Study population: Obstetric inpatients
Sample size: 9,475
Location: Alexandria

see also consang.net.

From Consanguineous matings in the Egyptian population:

“SUMMARY A total of 26 554 Egyptians was ascertained to study the incidence of consanguineous marriages. They were of different ages, different socioeconomic standards, and from different areas. There were 7646 from urban areas, 11 280 from suburban areas, and 7628 from rural areas. The incidence of consanguineous matings in the general population was found to be 28-96% with an average inbreeding coefficient of 0-010, which could be considered high. The highest incidence was that in the rural areas. First cousin marriages occurred more often than the other types of consanguinity.”

Average consanguinity rate is 28.96%; average inbreeding coefficient = 0.0101
Urban = 22.05%; inbreeding coefficient = 0.0092
Suburban = 26.79%; inbreeding coefficient = 0.0105
Rural = 39.11%; inbreeding coefficient = 0.0147

Collection period: unknown; late-1970s/early 1980s?
Study population: Schools, universities, companies, outpatient clinics.
Sample size: 26,554
Location: Urban: 7,646 from the cities of Cairo and Alexandria. Suburban: 11,280 from Mansoura and Talkha. Rural: 7,628 who were all the families in four villages located in different areas and representing the classical Egyptian village. It’s not clear where these four villages were located – Delta region? Nile Valley? Frontier Governorates?

see also consang.net.

~ ~ ~ ~ ~

So far then:

Early 1980s(?) consanguinity rate = 28.96%
2000 Total consanguineous marriages = 37.8%
2008 Total consanguineous marriages = 29.7%

From Consanguinity and incidence of thalassaemia in Egypt:

“Of the 505 parental couples 177 were first cousins, i.e. 23% [23.2%]. Among the probands 91 were married and 13 of them to first cousins, i.e. 14% [14.4%]. The difference is not statistically significant (0.05<P<0.1) but may indicate a secular downward trend in the incidence of first-cousing marriages in Egypt….

The inbreeding coefficient (F1) of a first-cousin marriage is 1/16 or 0.0625. Consequently, the F1 of the probands' parental generation is 117/505 x 0.0625 or 0.0145 and for the married probands 13/91 x 0.0625 or 0.0089. For the following calculations we have used a weighted average of the two inbreeding coefficients, which is F1 = 0.0137."

First cousin marriages, parents = 23.2%
First cousin marriages, probands = 14.4%
First cousin marriages, total (weighted average) = 18.4%

Inbreeding coefficient = 0.0137 (weighted average)

Note that consang.net uses the figure of 0.0145 for the inbreeding coefficient, i.e. the number for just the parents, not including the probands.

Collection period: 1979-81
Study population: University/work survey; health clinic survey.
Sample size: 505 probands + 505 parental couples
Location: Cairo. The authors believed the samples to be representative, despite the fact that all the individuals currently lived in Cairo, since many of them had been born in other Delta/Nile Governorates. However, 132 of the male probands were students at Cairo University and another 74 (male and female) were employees at a corporation. These 206 individuals may not be representative of the population of Egypt on the whole (i.e. they may have above average IQs and, therefore, possibly were less likely to come from inbred families). 299 of the probands (female) were outpatients at gynecological clinics and, therefore, are likely more representative. *Note: the study does not include the Frontier Governorates.

see also consang.net.

~ ~ ~ ~ ~

So far then:

1979-81 – First cousin marriages = 18.4%
2000 – First cousin marriages = 21.8%
2008 – First cousin marriages = 15.6%

From the Egypt Demographic and Health Survey 2008:

Total consanguineous marriages = 29.7%
Total first cousin marriages = 15.6%; inbreeding coefficient = 0.0098
Total second cousin marriages = 7%; inbreeding coefficient = 0.00109
Total “other blood relative” marriages = 7.1%

Total FBD marriages = 9.8%; inbreeding coefficient = 0.0061

Urban consanguineous marriages = 23.2%
Rural consanguineous marriages = 34.3%

Urban 1C = 12.4%; inbreeding coefficient = 0.0078
Urban 2C = 5.3%; inbreeding coefficient = 0.0008
Rural 1C = 17.9%; inbreeding coefficient = 0.0112
Rural 2C = 8.3%; inbreeding coefficient = 0.0013

Urban Governorates = 23.2%
Lower Egypt urban = 18%
Lower Egypt rural = 25.3%
Upper Egypt urban = 28.2%
Upper Egypt rural = 47.2%
Frontier Governorates = 34.2%

Urban Governorates = Cairo, Alexandria, Port Said, and Suez (no rural population)
Lower Egypt = 9 Lower Egypt governorates totally (Nile Delta)
Upper Egypt = 8 Upper Egypt governorates totally (Nile Valley)
Frontier Governorates = 5 governorates on eastern/western boundaries

Collection period: 2008
Study population: A nationally representative sample of ever-married women aged 15-49.
Sample size: 16,527
Location: Nation-wide.