Correlation between auding and reading test performance for various studies, as a function of school grade level.
when in grade one, the correlation coefficient is point three five.
in grade two, it is point four.
in grade three, it is point four eight.
in grade four, it is point five eight.
in grade five, it is point five nine.
in grade six, it is point six four.
in grade eight to ten, it is point five six.
in grade eleven and twelve, it is point five seven.
in grade college, it is point six one.