GDS Total Calculator
GDS 30independently reverse-coded binary items under the actual verified version, not GDS15. Sum only independently assessed codes for the declared instrument/version; exact maxima [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] and minima [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]. Unknown items preserve possible total bounds without imputation. No questionnaire reproduction, clinical item assignment, norm, diagnosis, treatment or outcome prediction.
Description
The 30-item Geriatric Depression Scale uses independently coded responses under an adopted version.
The 30-item Geriatric Depression Scale uses independently coded responses under an adopted version.1
A possible score range does not administer or interpret the questionnaire.
When to use GDS Total Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Establish the assessment or recording protocol, units, instrument version and independently applicable reference or calibration.
How to use GDS Total Calculator and understand its results
- Establish the assessment or recording protocol, units, instrument version and independently applicable reference or calibration.
- Enter independentlyCodedItemScores, itemKnownFlags, using the field meanings and rules below, then run the tool.
- Read result.knownItemSum, result.minimumPossibleTotal, result.maximumPossibleTotal, result.unknownItemIndices. Use the units and sign conventions below. Review unresolved records and any possible bounds separately from known results.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| independentlyCodedItemScores | Independently coded item scores | list of number | Required |
| itemKnownFlags | Item known flags; binary 1 means the matched observation is known, 0 means unknown | list of number | Required |
Enter exactly 30 independently coded scores and matched binary known flags. The per-position inclusive minima are [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] and maxima are [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]. Scores must be multiples of 1, checked within a 1e-10 tolerance in score/step. Every score, including an unknown placeholder, must obey the bounds. Sum known scores; add unknown minima and maxima for possible total bounds. Unknown item indices are zero-based. Reverse coding, administration, item order and applicability are externally established; the tool does not supply questions, perform an assessment or select clinical cutoffs. The adopted version is GDS-30, not GDS-15.
| Zero-based column | Criterion |
|---|---|
| 0 | Adopted component 0: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 1 | Adopted component 1: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 2 | Adopted component 2: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 3 | Adopted component 3: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 4 | Adopted component 4: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 5 | Adopted component 5: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 6 | Adopted component 6: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 7 | Adopted component 7: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 8 | Adopted component 8: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 9 | Adopted component 9: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 10 | Adopted component 10: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 11 | Adopted component 11: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 12 | Adopted component 12: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 13 | Adopted component 13: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 14 | Adopted component 14: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 15 | Adopted component 15: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 16 | Adopted component 16: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 17 | Adopted component 17: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 18 | Adopted component 18: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 19 | Adopted component 19: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 20 | Adopted component 20: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 21 | Adopted component 21: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 22 | Adopted component 22: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 23 | Adopted component 23: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 24 | Adopted component 24: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 25 | Adopted component 25: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 26 | Adopted component 26: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 27 | Adopted component 27: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 28 | Adopted component 28: minimum 0, maximum 1; independently apply the instrument's item order and key |
| 29 | Adopted component 29: minimum 0, maximum 1; independently apply the instrument's item order and key |
knownSum=Σ(score_i×known_i); possibleMin=knownSum+Σ_unknown(min_i); possibleMax=knownSum+Σ_unknown(max_i) Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result; its nested fields below contain the actual calculation or selected reference | object |
| result.knownItemSum | Sum of independently coded scores whose known flag equals 1; partial if any item is unknown | number |
| result.minimumPossibleTotal | Known contribution plus every unknown component's permitted minimum | number |
| result.maximumPossibleTotal | Known contribution plus every unknown component's permitted maximum | number |
| result.unknownItemIndices | Zero-based positions of items marked unknown | list |
{
"input": {
"independentlyCodedItemScores": [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1
],
"itemKnownFlags": [
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1
]
},
"output": {
"result": {
"knownItemSum": 30,
"minimumPossibleTotal": 30,
"maximumPossibleTotal": 30,
"unknownItemIndices": []
}
}
}Limitations and assumptions
Actual acquisition, assessment protocol, instrument version and calibration determine applicability. The tool does not examine a person, classify images, administer a questionnaire or choose diagnostic cutoffs.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Lists and matrices must be dense, without missing cells. Numeric lists allow at most 10000 entries; ordinary string lists allow at most 128 strings of 128 UTF-16 units each; numeric matrices allow at most 128 rows and 128 columns, subject to narrower requirements above. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use Yale-Brown Obsessive Compulsive Scale Calculator: The Yale–Brown obsessive-compulsive scale summarizes independently coded symptom-severity items under an adopted version. For a complementary comparison, use PHQ-9 Total Calculator: PHQ-9 totals summarize nine independently coded symptom items.
References
-
GDS Total Calculator — tool.io
Similar or alternative tools
- Yale-Brown Obsessive Compulsive Scale Calculator
The Yale–Brown obsessive-compulsive scale summarizes independently coded symptom-severity items under an adopted version.
- PHQ-9 Total Calculator
PHQ-9 totals summarize nine independently coded symptom items.