cliot (version 1.0.0)

patient_activity_scale_ra: Patient Activity Scale (PAS) and PAS-II for Rheumatoid Arthritis

Description

Calculates the Patient Activity Scale (PAS) and PAS-II to assess disease activity in Rheumatoid Arthritis. These scores rely entirely on patient-reported outcomes: Pain VAS, Patient Global Assessment VAS, and the Health Assessment Questionnaire-II (HAQ-II).

Usage

patient_activity_scale_ra(pain_vas, patient_global_vas, haq_ii_items)

Value

A list containing:

PAS_Score

The standard PAS score (Range 0-10).

PAS_II_Score

The PAS-II score (Range 0-10), often preferred for logarithmic scaling properties.

Disease_Activity

Classification (Remission <= 0.25, Low <= 3.7, Moderate < 8.0, High >= 8.0 based on PAS-II).

Arguments

pain_vas

Numeric (0-10). Patient's assessment of pain on a visual analog scale.

patient_global_vas

Numeric (0-10). Patient's global assessment of disease activity on a visual analog scale.

haq_ii_items

Numeric vector of length 10. Scores for the 10 HAQ-II items (0=No difficulty, 1=Some difficulty, 2=Much difficulty, 3=Unable to do). Items include: 1. Stand up from a straight chair? 2. Walk outdoors on flat ground? 3. Walk up 5 steps? 4. Wash entire body? 5. Reach and get down a 5lb object from above head? 6. Open car door? 7. Do outside work (yard work)? 8. Wait in line for 15 minutes? 9. Lift heavy objects? 10. Move heavy objects?

References

Wolfe F, Michaud K, Pincus T. Development and validation of the health assessment questionnaire II: a revised version of the health assessment questionnaire. Arthritis Rheum. 2004;50(10):3296-3305. doi:10.1002/art.20549

Examples

# Example 1: High Activity
# Pain 8, Global 9, HAQ-II mostly 2s and 3s
haq_high <- c(2, 2, 3, 1, 3, 2, 3, 1, 3, 2)
patient_activity_scale_ra(8, 9, haq_high)

# Example 2: Remission
# Pain 0, Global 0, HAQ-II all 0
haq_low <- rep(0, 10)
patient_activity_scale_ra(0, 0, haq_low)