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TWINS (ZWILLINGE) in my LINGNER Database

Obwohl die Gesamtzahl der Zwillinge in meiner Datei nicht aussergewöhnlich für europäische Trende ist, wurde es interessant sein zu wissen ob gewisse Familienlinien größere Tendenze zu Zwillingsgeburte hat.	Although the total number of twins in my database is not out of line with European trends, it would be interesting to know if certain family lines are more likely to have twins.
Laut "Study the Clones First" (Studiere erst die Klone) (DISCOVER Zeitschrift, August 2004) Zweeiige Zwillinge kommen zweimal so oft vor wie eineiige Zwillinge. Die Zahl der Zwillingsgeburte ist verschieden rund um die Welt: 1-2% in Europa, niedriger in Asien (0.6%), höher in Afrika (4%). Ältere Mütter haben mehr Zwillinge, besonders zweeiige Zwillinge.	According to "Study the Clones First" (DISCOVER magazine, August 2004) Fraternal twins occur twice as often as identical twins. Rate of twinning varies around the world: 1-2% in Europe, lower in Asia (0.6%), higher in Africa (4%). Older mothers are more likely to have twins, especially fraternal twins.

Statistics:

109 set of twins, 61 surnames:

41 sets = 2 boys (Jungen)
29 sets = 2 girls (Mädel)
39 sets = boy and girl (Junge und Mädel)

Statistically, only 36 of those sets would be identical twins.

Surnames:

Number of Twin Sets, grouped by mother's age:

Age of Mother FF MM FM Totals < 20 1 3 3 7 21-25 9 10 11 30 26-30 9 7 3 19 31-35 7 14 10 31 > 36 2 4 10 16 unknown age 1 3 2 6 Totals 29 41 39 109
FF = 2 females MM = 2 males FM = female & male

Details (chronologically):

• Living born after 1930 excluded (27 individuals). 
• 109 of the 162 twins with known death dates, died aged less than 15 years (67%). Usual mortality for children under 15 was about 45%