Patterns of Catholic-Protestant intermarriage in Northern Ireland

"Some of the social factors governing the incidence of religious intermarriage in Northern Ireland are reviewed before setting out data from a special tabulation of the 1971 census of Northern Ireland. According to the tabulation only some 2% of married couples enumerated declared themselves to be in Catholic-Protestant marriages....The tabulation suggests that the likelihood of marriage across the Catholic-Protestant divide is no greater for manual workers than for nonmanual workers when controls are introduced for relative group size.... There are indications that the incidence of Catholic-Protestant marriage was rising in Northern Ireland in the late 1960s."