Age equivalence chart for PLS-4?

[Guest guest]

Do you know where I could find an age equivalence chart for the

Preschool Language Scale Fourth Edition (PLS-4)?

My son's speaking vocabulary is the age equivalence of 2 years 11 mos

and his speech is the age equivalence of less than 2 years. My son is

now 4 years 8 mos.

I was wondering what his auditory comprehension and expressive

communication age equivalence is. He received a standard score of 86

and a percentile rank of 18 for auditory comprehension which places him

one standard deviation below the mean. He received a standard score of

82 and a percentile of 12 for expressive which also places him one

standard deviation below the mean. His total language score was 82 with

a percentile rank of 12 which places him one standard deviation below

the mean.

At my son's 3 years 8 mos evaluation at his private ST he was found to

be at 2 years 10 mos. His report said he had a mild vocabulary deficit

and now he has a mild to moderate vocabulary deficit? I hope he's not

getting worse!