Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_19517448_3 (completion_percentage VARCHAR, yards_per_attempt VARCHAR)
### Question:
What is the completion percentage when yards per attempt was done by Steve McNair : 2003?
### Answer:
SELECT completion_percentage FROM table_19517448_3 WHERE yards_per_attempt = "Steve McNair : 2003"