How accurate is the PSST-based?

Short answer: the PSST-based is a well-validated screening tool — good at flagging who should have a fuller evaluation, not at handing out a diagnosis. It was developed by Modeled on the PSST (Steiner, Macdougall & Brown) in 2003 and has been tested against clinical interviews in independent studies. A practical retrospective screen that flags whether premenstrual symptoms reach the level of significant PMS or probable PMDD, so you know whether prospective tracking is worthwhile.

What the numbers mean

Sensitivity is how often the test correctly flags people who do have the condition; specificity is how often it correctly clears those who don't. High figures on both mean the PSST-based misses few real cases while raising few false alarms — which is exactly what you want from a first-pass screen.

The honest limits

No screening tool is perfect, and self-administration online adds its own caveats:

• PMDD is defined by timing, so it can only be confirmed by daily ratings across two cycles — not by a one-time screen.
• Retrospective recall is less reliable than a live symptom diary.
• Depression, anxiety, thyroid problems, and perimenopause can mimic or worsen premenstrually (premenstrual exacerbation) and need ruling out.

Does taking it online change the accuracy?

The questions and scoring here are identical to the clinical version, so the instrument itself is unchanged. What differs is context: a clinician also weighs your history, rules out other causes, and interprets borderline scores. That's why every result here points you toward a professional rather than standing in for one. Reproducing the instrument faithfully is our job; diagnosing is theirs.