Average weekly earnings for zero-hour workers are £188, compared with £479 for permanent.
The article based its report on unpublished data from the Office for National Statistics (ONS).
The ONS has estimated there are 1.4 million contracts with no guaranteed minimum hours.
The contracts mean employees work only when they are needed by employers, often at short notice. Their pay depends on how often they work.
This is not legal advice; it is intended to provide information of general interest about current legal issues.