Table 1

Age and sex of participants, stratified by family role
Nind % women Mean age (sd)
Twins 8,093 68.8 33.5 (14.5)
Higher-order multiples (triplets/quadruplet) 155 70.3 25.9 (11.9)
Parents of twins 5,198 59.2 55.9 (8.1)
Spouses 875 38.7 44.3 (11.8)
Non-twin siblings 1,898 63.4 38.3 (13.9)
Other1 368 64.4 33.8 (10.1)
Total 16,587 63.5 41.6 (16.0)

1 includes multiples without information on co-multiples (N=35), participants registered without any family members (N=16), spouses of siblings of twins (N=28), children of twins/siblings (N=288), and a spouse of a child of a twin (N=1).

Geels et al.

Geels et al. BMC Public Health 2013 13:207   doi:10.1186/1471-2458-13-207

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