Test-retest analysis of the SPARRA questionnaire (n=51 after 1 week, n=90 after 6 months)
| Items | % agreement* | Weighted kappa | Percentage with the symptom† | |||
| 1 week | 6 months | 1 week | 6 months | 1 week | 6 months | |
| Joint pain: severity‡/impact§ | 84/92 | 77/77 | 0.60/0.78 | 0.37/0.41 | 75 | 80 |
| Joint swelling: severity/impact | 95/94 | 83/83 | 0.80/0.77 | 0.42/0.44 | 28 | 37 |
| Joint stiffness: severity/impact | 88/93 | 79/81 | 0.71/0.78 | 0.47/0.45 | 69 | 74 |
| Burning sensations: severity/impact | 90/92 | 81/83 | 0.64/0.61 | 0.43/0.42 | 20 | 33 |
| Tingling sensations: severity/impact | 90/93 | 85/84 | 0.62/0.64 | 0.53/0.35 | 41 | 40 |
| Numbness: severity/impact | 90/94 | 83/85 | 0.53/0.67 | 0.27/0.27 | 26 | 27 |
| Changes in skin colour: severity/impact | 96/98 | 83/91 | 0.67/0.71 | 0.09/0.20 | 20 | 20 |
| Muscle cramps: severity/impact | 92/95 | 84/87 | 0.63/0.71 | 0.43/0.39 | 28 | 36 |
| Weakness or loss of strength: severity/impact | 92/93 | 78/76 | 0.81/0.81 | 0.43/0.34 | 57 | 56 |
| Fatigue: severity/impact | 93/92 | 80/79 | 0.81/0.82 | 0.52/0.50 | 69 | 63 |
| Emotional distress: severity/impact | 93/95 | 77/80 | 0.78/0.83 | 0.37/0.41 | 47 | 39 |
| Concentration difficulties: severity/impact | 93/94 | 86/87 | 0.76/0.78 | 0.58/0.58 | 33 | 39 |
| Sleep problems: severity/impact | 90/93 | 81/83 | 0.77/0.80 | 0.54/0.54 | 55 | 49 |
| Left fingers/right fingers | 91/90 | 78/73 | 0.74/0.76 | 0.41/0.32 | 49/53 | 61/53 |
| Left wrist/right wrist | 93/97 | 83/80 | 0.75/0.90 | 0.43/0.40 | 35/28 | 39/38 |
| Left elbow/right elbow | 96/95 | 87/87 | 0.79/0.78 | 0.42/0.44 | 20/22 | 31/27 |
| Left shoulder/right shoulder | 94/93 | 82/81 | 0.81/0.77 | 0.45/0.44 | 39/37 | 40/40 |
| Left hip/right hip | 95/95 | 88/83 | 0.80/0.83 | 0.52/0.40 | 28/29 | 29/33 |
| Left knee/right knee | 96/94 | 82/82 | 0.85/0.81 | 0.34/0.46 | 29/33 | 42/43 |
| Left ankle/right ankle | 96/95 | 85/91 | 0.83/0.79 | 0.47/0.62 | 28/28 | 27/22 |
| Left toes/right toes | 95/97 | 87/88 | 0.76/0.85 | 0.49/0.56 | 24/22 | 29/32 |
| Neck/back | 90/90 | 81/81 | 0.73/0.74 | 0.42/0.48 | 55/55 | 44/48 |
Interpretation of the weighted kappa: 0=only chance agreement, ≤0.20=poor, 0.21–0.40=fair, 0.41–0.60=moderate, 0.61–0.80=good, 0.81–1.00=excellent/perfect.
*Retest analysis per item of severity and impact of a symptom (severity: none, mild, moderate, severe; impact: no impact, small impact, moderate impact, large impact).
†Percentage of patients that had the symptom at least 1 day in the past month at week 1 and month 6.
‡For each symptom answering the question: over the past month how much (symptom) have you had?
§For each symptom answering the question: what impact has this (symptom) had on the ability to carry out daily activities.
SPARRA, Symptoms in Persons At Risk of Rheumatoid Arthritis.