How To Score Conners 39- Parent Rating Scale-revised L Jun 2026

| Mistake | Why it’s wrong | | :--- | :--- | | | The Long Form has different item distributions. T-scores are not interchangeable. | | Averaging instead of summing | Each subscale requires a total raw sum, not a mean. | | Ignoring the 3-point anchor | "3" is "very much true," not "sometimes." Parents need coaching to avoid central tendency bias. | | Scoring without age adjustment | A raw score of 15 on Inattention for a 6-year-old is normal; for a 14-year-old, it is pathological. | | Using hand-scoring without verification | Always double-check addition. A one-point error can shift a T-score by 3–5 points. |

(mean of 50, standard deviation of 10) using normative tables provided in the official Conners manual Demographics how to score conners 39- parent rating scale-revised l