neck_disability_index: Neck Disability Index (NDI)

In cliot: Clinical Indices and Outcomes Tools

Neck Disability Index (NDI)

Description

Calculates the Neck Disability Index (NDI), a standard instrument for measuring self-rated disability due to neck pain. It consists of 10 items related to daily activities, each scored from 0 to 5. The final score provides a percentage of disability.

Usage

neck_disability_index(pain_intensity, personal_care, lifting, reading,
                      headaches, concentration, work, driving, sleeping,
                      recreation)

Arguments

pain_intensity	Numeric (0-5). 0: No pain; 5: Worst imaginable pain.
personal_care	Numeric (0-5). 0: Can look after self normally; 5: Needs help with all personal care.
lifting	Numeric (0-5). 0: Can lift heavy weights; 5: Cannot lift or carry anything.
reading	Numeric (0-5). 0: Can read as much as wanted; 5: Cannot read at all.
headaches	Numeric (0-5). 0: No headaches; 5: Frequent/severe headaches almost all the time.
concentration	Numeric (0-5). 0: Can concentrate fully; 5: Cannot concentrate at all.
work	Numeric (0-5). 0: Can do as much work as wanted; 5: Cannot do any work.
driving	Numeric (0-5). 0: Can drive as long as wanted; 5: Cannot drive at all.
sleeping	Numeric (0-5). 0: No trouble sleeping; 5: Sleep is completely disturbed (1-2 hours).
recreation	Numeric (0-5). 0: Able to engage in all activities; 5: Cannot do any recreational activities.

Value

A list containing:

NDI_Score_Raw	The sum of the section scores (Range 0-50).
NDI_Percentage	The raw score converted to a percentage (Score * 2).
Interpretation	Clinical severity of disability (None, Mild, Moderate, Severe, Complete).

References

Vernon H, Mior S. The Neck Disability Index: a study of reliability and validity. J Manipulative Physiol Ther. 1991;14(7):409-415.

Examples

# Example 1: Severe Disability
# Moderate to high scores across all domains
neck_disability_index(3, 2, 4, 3, 3, 2, 4, 3, 2, 3)

# Example 2: Mild Disability
# Minor pain and headache, mostly normal function
neck_disability_index(1, 0, 1, 0, 1, 0, 0, 0, 1, 0)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.