1. Be a contributing factor
Human error may have been a contributing factor.
2. Be contributing to
Stress is widely perceived as contributing to coronary heart disease.
3. Be attributable to
The health problems are attributable to a poor diet and lack of exercise.
4. Be attributed to
Juvenile delinquency can be attributed to parental permissiveness.
5. ⋯, if for no other reason than
It is essential, if for no other reason that the cost, that people should stop smoking.
6. ⋯, if only because
We are confident if only because we are making progress.
7. ⋯, not least because
His English is excellent, not least because he was educated at a British boarding school.