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Table 1 Information on previous births and induced abortions in three data sets

From: Births and induced abortions among women of Russian, Somali and Kurdish origin, and the general population in Finland –comparison of self-reported and register data

The Maamu survey data The Finnish Medical Birth Register The Register of Induced Abortions
Self-reported births Registered births (from year 1987) Registered induced abortions (from year 1983)
Self-reported induced abortions Self-reported previous births among those with given births in Finland since 1987 Self-reported previous induced abortions among those with induced abortions in Finland since 1983
  Self-reported previous induced abortions among those with given births in Finland since 1987 Self-reported previous births among those with induced abortions in Finland since 1983
Combined survey and register data
maximum number of births/induced abortions in survey or register
dichotomous variables for births/induced abortions: 1) no births/induced abortion, 2) at least one birth/induced abortion
categorized number of births: no births, 1–2 births and 3 or more births
categorized number of induced abortion: no induced abortions, one induced abortion and two or more induced abortions