add phq-8

[sharlotta93]

User description

add phq-8

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PR Type

enhancement, tests, documentation

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Description

• Integrated PHQ-8 into the calculation library, allowing it to be used alongside other calculations.
• Defined the input questions, output structure, and interpretation table for PHQ-8.
• Implemented the calculation logic for PHQ-8, including score computation and interpretation.
• Added comprehensive unit tests for PHQ-8, covering various response scenarios and validation checks.
• Corrected a test in PHQ-9 to ensure accurate interpretation of severe depression.
• Provided documentation for PHQ-8, detailing its purpose, calculation method, and interpretation guidelines.

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Changes walkthrough 📝

	Relevant files
Enhancement	6 files calculation_library.ts Integrate PHQ-8 into calculation library                                  src/calculation_suite/calculations/calculation_library.ts Added import for phq_8. Included phq_8 in the CALCULATIONS export. +2/-0      index.ts Export PHQ-8 definitions                                                                  src/calculation_suite/calculations/phq_8/definition/index.ts Exported PHQ-8 inputs, output, and interpretation table. +3/-0      phq8_interpretation.ts Define PHQ-8 interpretation table                                                src/calculation_suite/calculations/phq_8/definition/phq8_interpretation.ts Defined interpretation table for PHQ-8 scores. +36/-0    phq_8_inputs.ts Define PHQ-8 input questions and answers                                  src/calculation_suite/calculations/phq_8/definition/phq_8_inputs.ts Defined input questions and allowed answers for PHQ-8. +252/-0  phq_8_output.ts Define PHQ-8 output structure                                                        src/calculation_suite/calculations/phq_8/definition/phq_8_output.ts Defined output structure for PHQ-8 calculation results. +14/-0    phq_8.ts Implement PHQ-8 calculation logic                                                src/calculation_suite/calculations/phq_8/phq_8.ts Implemented PHQ-8 calculation logic. Included score calculation and interpretation. +62/-0
Tests	2 files phq_8_test_responses.ts Add test data for PHQ-8 responses                                                src/calculation_suite/calculations/phq_8/testdata/phq_8_test_responses.ts Added test data for best, worst, and random responses for PHQ-8. +35/-0    phq_8.test.ts Add unit tests for PHQ-8 calculation                                          src/calculation_suite/calculations/phq_8/phq_8.test.ts Added unit tests for PHQ-8 calculation. Tested various response scenarios and validation. +148/-0
Bug fix	1 files phq_9.test.ts Fix PHQ-9 test for severe depression interpretation            src/calculation_suite/calculations/phq_9/phq_9.test.ts Corrected test expectation for PHQ-9 severe depression interpretation. +1/-1
Documentation	1 files README.md Add documentation for PHQ-8                                                            src/calculation_suite/calculations/phq_8/README.md Added documentation for PHQ-8 including introduction, calculation, and interpretation. +24/-0

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Error Handling Ensure that the calculation handles cases where input values are not strictly numeric or are out of the expected range, as this could lead to incorrect scoring or application crashes. Typo in Variable Name The variable 'PHQ8_INTERPRATION_TABLE' should be renamed to 'PHQ8_INTERPRETATION_TABLE' to correct the typo and maintain consistency.

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Score
Possible issue	Add a fallback for missing entries in PHQ8_INTERPRATION_TABLE to handle unexpected scores gracefully Ensure that the calculate_score function handles cases where PHQ8_INTERPRATION_TABLE does not have an entry for the calculated score, to avoid potential runtime errors. src/calculation_suite/calculations/phq_8/phq_8.ts [35-45] const total_score = R.sum(valid_inputs); +const interpretation = PHQ8_INTERPRATION_TABLE[total_score.toString()] || 'Unknown'; return [ { id: 'PHQ8_SCORE', score: total_score, }, { id: 'PHQ8_INTERPRETATION', - score: PHQ8_INTERPRATION_TABLE[total_score.toString()], + score: interpretation, }, ]; Suggestion importance[1-10]: 8 Why: Adding a fallback for missing entries in PHQ8_INTERPRATION_TABLE is crucial to prevent runtime errors, ensuring the application handles unexpected scores gracefully and maintains robustness.	8
Enhancement	Change the key type in PHQ8_INTERPRATION_TABLE from string to number for direct numeric access Consider using a numeric type for the keys in the PHQ8_INTERPRATION_TABLE to avoid the need to convert scores to strings when looking up interpretations. src/calculation_suite/calculations/phq_8/definition/phq8_interpretation.ts [8-36] export const PHQ8_INTERPRATION_TABLE: { - [key in string]: DepressionSeverityType + [key: number]: DepressionSeverityType } = { - '0': 'None/minimal depression', + 0: 'None/minimal depression', ... } Suggestion importance[1-10]: 7 Why: Changing the key type from string to number in PHQ8_INTERPRATION_TABLE improves code clarity and avoids unnecessary string conversion, enhancing performance and maintainability.	7
Best practice	Add validation for allowed_answers values to ensure they are within the expected range Consider adding validation to ensure that the value fields in allowed_answers are within the expected range (0-3) to prevent configuration errors. src/calculation_suite/calculations/phq_8/definition/phq_8_inputs.ts [12-32] allowed_answers: [ { label: { en: 'Not at all', nl: 'Helemaal niet' }, value: 0, }, ... -], +].map(answer => { + if (answer.value < 0 || answer.value > 3) throw new Error('Invalid answer value'); + return answer; +}), Suggestion importance[1-10]: 7 Why: Adding validation for allowed_answers values ensures data integrity and prevents configuration errors, enhancing the reliability of the input data handling.	7
Maintainability	Refactor repeated input_type structures into a shared constant or function to enhance code maintainability Refactor the repeated structure of input_type across different inputs to a function or constant to reduce code duplication and improve maintainability. src/calculation_suite/calculations/phq_8/definition/phq_8_inputs.ts [10-32] -input_type: { +const defaultInputType = { type: 'number', allowed_answers: [ { label: { en: 'Not at all', nl: 'Helemaal niet' }, value: 0, }, ... ], -}, +}; +input_type: defaultInputType, Suggestion importance[1-10]: 6 Why: Refactoring repeated input_type structures into a shared constant reduces code duplication, improving maintainability and readability, though it does not address any critical issues.	6