What clinical mood scales mean (and why a compact anchor beats 1–10)

When a psychiatrist or therapist says "rate your mood," they usually do not mean on a slider that goes to 10. The standard clinical instruments use compact ordinal ranges, most often 0 to 3 or 0 to 4 per item. Here is what those scales are, and why the small range is doing real work.

The four scales worth knowing

HAM-D (Hamilton Depression Rating Scale). Hamilton 19601960. The original clinician-administered depression scale. Most items are scored 0 to 4, with a few on a 0 to 2 anchor. It has been the workhorse of depression research for sixty years.

YMRS (Young Mania Rating Scale). Young et al. 19781978. The mania equivalent. Each item runs 0 to 4 or 0 to 8 depending on the symptom; clinically administered.

ASRM (Altman Self-Rating Mania Scale). Altman et al. 19971997. A patient-administered version of mania rating, with each item on a 0 to 4 anchor, designed to be filled in by the person, not the clinician.

GAD-7 (Generalized Anxiety Disorder 7-item). Spitzer et al. 20062006. A short, validated anxiety screen. Each of seven items is scored 0 to 3.

PHQ-9 (Patient Health Questionnaire 9-item). Kroenke et al. 20012001. The PHQ-9 is the depression equivalent of the GAD-7. It also uses a 0–3 anchor on each of nine items.

The pattern is clear. The clinical short scales used in research and primary care settle into compact ordinal anchors: 0 to 3 (GAD-7, PHQ-9) or 0 to 4 (HAM-D, YMRS, ASRM, with a few exceptions). The point is the small range, not the exact ceiling.

Why 0–3 instead of 1–10

A 0–3 scale forces a decision: nothing, mild, moderate, severe. There is no "is today a 6 or a 7" equivocation, because there are no 6s and 7s. That has two big effects.

Stability over time. A slider invites drift. Last month's 5 might mean nothing this month. A 0–3 anchor stays stable across weeks and months because the gradations are spelled out.

Speed. Four buttons fits in your pocket. You commit and move on. Brief measures get filled in; long ones get abandoned2001. That is the whole reason the PHQ-9 became standard.

What MoodSync does with this

MoodSync uses 0–3 self-rating anchors for depression, elevation, irritability, and anxiety. The compact 0–3 range matches the range used by the GAD-7 and PHQ-9 (which use frequency anchors: "not at all" through "nearly every day"), and sits in the same compact-ordinal tradition as the HAM-D, YMRS, and ASRM (which use 0–4 with severity anchors). MoodSync's anchors are severity-based (none, mild, moderate, severe), so the spirit is shared but the wording differs from each instrument. The scales are not the validated instruments themselves; they are short self-ratings inspired by them.

If you want to see them in context, the bipolar mood scale feature page walks through each axis, and the for-bipolar page puts them in the larger flow.

A note on the limits

This is an explainer, not a diagnostic tool. For a real PHQ-9 or YMRS score, take the validated instrument with a clinician — don't extrapolate from a self-tracker.