I agree with BLR that staying in a marriage is not always the healthy choice. If you look at social issues back in the days leading up to prohibition, a leading reason so many women were for prohibition is that their husbands were getting drunk and beating them and their children. They could not leave, they were trapped in an abusive situation. If you read about the lobbying for prohibition, a great impetus for it was to save the women and children from being beaten up and killed.
So yes, they had a much higher "long years marriage rate". I am not sure it was necessarily a good thing.