An Op-Ed piece in the New York Times, by

Mediocre teacher preparation extends to mathematics. An international study of new middle school teachers showed that Americans scored worse on a math test than teachers in countries where kids excelled, like Singapore and Poland. William Schmidt of Michigan State University identified the common-sense explanation: American teachers take fewer math classes. Instead, they take more courses in general pedagogy — coursework, that is, on theories of instruction, theories of child development and the like.

Can anyone give references to “an international study of new middle school teachers”? What was UK’s results in the study?