Geriatric Depression Scale (GDS-30 & GDS-15): Scoring, CSDD, and EPDS Compared

The Geriatric Depression Scale (GDS)—developed by Jerome A. Yesavage, T. L. Brink, and colleagues at Stanford University and the Palo Alto VA Medical Center (Yesavage et al., 1982–1983)—is a public-domain, self-report screening instrument designed specifically to detect depression in older adults. Unlike general adult depression questionnaires such as the PHQ-9 or Beck Depression Inventory-II (BDI-II), both the 30-item Long Form (GDS-30) and the 15-item Short Form (GDS-15; Sheikh & Yesavage, 1986) intentionally exclude somatic and vegetative complaints (sleep disturbance, appetite loss, weight change, fatigue, and sexual dysfunction) and replace 4-point Likert grids with dichotomous Yes/No questions to reduce cognitive burden in geriatrics clinical practice and aging research.

Why Does the Yesavage Geriatric Depression Scale (GDS-30 and GDS-15) Exclude Somatic Symptoms Used in the PHQ-9 and BDI-II?

In general adult populations, somatic neurovegetative symptoms—insomnia, psychomotor slowing, daytime fatigue, anorexia, and gastrointestinal or musculoskeletal complaints—are core diagnostic criteria for Major Depressive Disorder (MDD). However, in older adults with chronic medical multimorbidity (such as osteoarthritis, heart failure, chronic kidney disease, or benign prostatic hyperplasia) and physiological sleep architecture changes, those same physical symptoms frequently occur in the absence of a mood disorder. Including somatic items on a geriatric screening tool inflates total scores and generates high false-positive rates among medically ill older adults.

Yesavage and colleagues (Journal of Psychiatric Research, 1982–1983) empirically tested 100 candidate affective and cognitive items and retained the 30 questions with the highest item-total correlations with clinical depression in older adults—focusing on life satisfaction, helplessness, hopelessness, boredom, social withdrawal, worthlessness, and subjective memory complaints while omitting somatic and suicidal ideation items. They also selected a binary Yes/No response format over multi-level Likert scales because older patients with mild cognitive impairment or visual/executive fatigue complete dichotomous items with higher test-retest reliability.

GDS-15 vs. GDS-30: Item Structure, Reverse Scoring, and Cutoffs

Both the 30-item Long Form (GDS-30) and the 15-item Short Form (GDS-15) assess how the respondent has felt over the past week. Each item contributes either 0 or 1 point toward the total depression score. To prevent acquiescence bias (yea-saying or nay-saying), both versions mix negatively worded items (where “Yes” indicates depression and scores 1 point) with positively worded items (where “No” indicates depression and scores 1 point):

• GDS-30 (Long Form, Range 0–30): Contains 20 negatively phrased items (Yes = 1, No = 0) and 10 reverse-scored positively phrased items (Items 1, 5, 7, 9, 15, 19, 21, 27, 29, 30, where No = 1, Yes = 0). Standard Yesavage et al. severity cutoffs are:
  • 0–9: Normal / no clinically significant depressive symptoms
  • 10–19: Mild-to-moderate depressive symptoms (sensitivity ~84–92%, specificity ~89–95% at cutoff ≥10 or ≥11)
  • 20–30: Severe depressive symptoms
• GDS-15 (Short Form, Range 0–15): Extracted by Sheikh and Yesavage (1986) from the 15 GDS-30 items showing the highest correlation with depressive symptoms. It takes 5–7 minutes to administer and comprises 10 items where Yes = 1 point (Items 2, 3, 4, 6, 8, 9, 10, 12, 14, 15) and 5 reverse-scored positive items where No = 1 point:
  1. Item 1: “Are you basically satisfied with your life?” (No = 1)
  2. Item 5: “Are you in good spirits most of the time?” (No = 1)
  3. Item 7: “Do you feel happy most of the time?” (No = 1)
  4. Item 11: “Do you think it is wonderful to be alive now?” (No = 1)
  5. Item 13: “Do you feel full of energy?” (No = 1)

  Standard GDS-15 clinical and trial cutoffs are 0–4 (normal), 5–8 (mild depression; standard screening cutoff ≥5), 9–11 (moderate depression), and 12–15 (severe depression).

How Is the 15-Item GDS-15 Scored vs. the 19-Item Alexopoulos Cornell Scale for Depression in Dementia (CSDD)?

While the self-report GDS-15 remains valid in cognitively intact older adults and individuals with mild cognitive impairment (MMSE ≥ 15–18), its validity degrades in moderate-to-severe dementia because anosognosia, aphasia, and episodic memory deficits impair self-report accuracy. For patients with dementia across all severity stages, the gold-standard instrument is the Cornell Scale for Depression in Dementia (CSDD), developed by George S. Alexopoulos and colleagues at Cornell University (Biological Psychiatry, 1988).

The CSDD is a 19-item clinician-administered instrument (total score range 0–38) that synthesizes semi-structured interviews with both an informant/caregiver (evaluating observed behavior over the past week) and the patient (short direct interview). If caregiver and patient reports conflict, the clinician uses clinical judgment to assign each of the 19 items a rating of 0 = absent, 1 = mild or intermittent, 2 = severe, or a = unable to evaluate across five domains:

1. Mood-Related Signs (Items 1–4): Anxiety, sadness, lack of reactivity to pleasant events, irritability.
2. Behavioral Disturbance (Items 5–8): Agitation, retardation, multiple physical complaints, acute loss of interest.
3. Physical Signs (Items 9–11): Appetite loss, weight loss, lack of energy.
4. Cyclic Functions (Items 12–15): Diurnal variation of mood, difficulty falling asleep, multiple awakenings, early morning awakening.
5. Ideational Disturbance (Items 16–19): Suicide, poor self-esteem, pessimism, mood-congruent delusions.

On the CSDD (0–38), a total score of ≥8 indicates probable significant depressive symptoms, and a score of ≥12 indicates definite or moderate-to-severe major depression in dementia.

How Is the 10-Item Cox Edinburgh Postnatal Depression Scale (EPDS) Scored in Perinatal Mental Health Studies?

Just as geriatric assessment requires excluding age-related somatic confounders, perinatal and postpartum psychiatry requires a specialized scale because normal physiological changes of pregnancy and the puerperium—sleep deprivation from infant feeding, postpartum weight changes, and physical exhaustion—confound standard adult depression inventories. John L. Cox, Jeni M. Holden, and Ruth Sagovsky (British Journal of Psychiatry, 1987) developed the 10-item Edinburgh Postnatal Depression Scale (EPDS) to address this exact limitation.

• Item Structure and Scoring (Range 0–30): The EPDS consists of 10 self-report items assessing mood, anxiety, anhedonia, self-blame, and coping over the past 7 days. Each item is scored on a 4-point ordinal scale (0–3), with 7 items reverse-scored (Items 3, 5, 6, 7, 8, 9, 10) from top to bottom.
• Validated Perinatal Cutoffs: A total score of ≥10 is used in primary care and obstetrics as a sensitive threshold for possible minor or major depression (warranting repeat screening in 2 weeks or clinical evaluation), whereas ≥13 indicates probable major postpartum depression.
• Mandatory Item 10 Self-Harm Check: Regardless of whether the total EPDS score is below 10, clinicians and trial coordinators must separately inspect Item 10 (“The thought of harming myself has occurred to me”). Any non-zero endorsement (1 = Hardly ever, 2 = Sometimes, or 3 = Yes, quite often) requires immediate clinical suicide risk evaluation.

Population-Specific Depression Scales: Side-by-Side Comparison

In psychiatry and electronic clinical outcome assessment (eCOA) trial design, investigators select among population-specific depression scales based on age group, cognitive status, and somatic confounding:

Instrument	Target Population	Items & Administration	Score Range & Cutoffs	Handling of Somatic / Safety Items
GDS-30 / GDS-15 (Yesavage et al., 1983; Sheikh & Yesavage, 1986)	Older adults (≥60–65 years) with intact cognition or mild cognitive impairment	30 or 15 binary Yes/No self-report items (5 reverse-scored on GDS-15)	GDS-30: 0–30 (≥10 mild, ≥20 severe) GDS-15: 0–15 (≥5 positive screen)	Excludes somatic/vegetative items and explicit suicide items to prevent medical comorbidity confounding
CSDD (Alexopoulos et al., 1988)	Older adults with mild, moderate, or severe dementia	19 clinician-rated items (0–2) combining caregiver and patient interviews	0–38 (≥8 probable depression; ≥12 definite/moderate-severe)	Includes observed behavioral, cyclic sleep, physical, and suicide/delusion items rated via dual informants
EPDS (Cox et al., 1987)	Pregnant and postpartum individuals (perinatal psychiatry)	10 self-report items rated 0–3 over past 7 days	0–30 (≥10 possible depression; ≥13 probable major depression)	Excludes somatic pregnancy/postpartum confounders; includes dedicated Item 10 self-harm item

In comprehensive geriatric assessments, the GDS-15 is routinely paired with anxiety screening via the GAD-7, frailty staging via the Clinical Frailty Scale (CFS), and inpatient fall-risk screening via the Hendrich II Fall Risk Model (which explicitly weights symptomatic depression as a 2-point intrinsic fall risk factor).

Frequently Asked Questions

Why does the Yesavage Geriatric Depression Scale (GDS-30 and GDS-15) exclude somatic symptoms used in the PHQ-9 and BDI-II?

Older adults frequently experience sleep disturbances, fatigue, appetite changes, and chronic pain from non-psychiatric medical conditions and normal aging. Including those somatic symptoms on a geriatric depression screen causes high false-positive rates, so Yesavage et al. restricted the GDS to affective and cognitive items rated in a simple Yes/No format.

How is the 15-item GDS-15 scored (5 reverse-scored yes/no items, cutoff ≥5) vs. the 19-item Alexopoulos Cornell Scale for Depression in Dementia (CSDD)?

The GDS-15 sums 15 binary Yes/No self-report items (0–15 total, cutoff ≥5), scoring 1 point for “No” on five positive items (Items 1, 5, 7, 11, and 13) and 1 point for “Yes” on the remaining ten items. Because self-report loses reliability when MMSE falls below 15, the 19-item CSDD (0–38 total, cutoff ≥8 probable and ≥12 definite depression) uses a clinician rating (0–2 per item) synthesized from both caregiver observation and a brief patient interview.

How is the 10-item Cox Edinburgh Postnatal Depression Scale (EPDS, 0–30, Item 10 self-harm check) scored in perinatal mental health studies?

The EPDS sums 10 four-point items (0–3 per item, total 0–30) over a 7-day recall period while omitting normal pregnancy/postpartum somatic symptoms. Scores of ≥10 indicate possible depression and ≥13 indicate probable major postpartum depression, while any score ≥1 on Item 10 (thoughts of self-harm) triggers immediate safety assessment regardless of total score.