Table 2.

Different questionnaires used to assess satisfaction, functional outcome, and quality of life

Outcome	Extremity	Age category	Number of items	Summary score	Non-inferiority margin (MCID)
Satisfaction with treatment	Either	All participants	1 item; 0–100 VAS	Rating scale (0–10*)	−0.7 points
Functional outcome
No questionnaire	Either	0–3
PROMIS UE SF	Upper	4–17	8 items; 5P Likert	T-score	Not available
PROMIS Mobility SF	Lower	4–17	8 items; 5P Likert	T-score	−3.0 points
QuickDASH	Upper	≥18	11 items; 5P Likert	Total (100–0*)	+15.91 points
LEFS	Lower	≥18	20 items; 5P Likert	Total (0–80*)	−9.0 points
Health-related QoL
No questionnaire	Either	0–3
EQ-5D-Youth	Either	4–11, and 12–17 (if proxy)	5 items; 3 levels, 1 item; 0–100 VAS	Index (0–1*) VAS score (0–100*)
EQ-5D-5L	Either	≥18, and 12–17 (self-complete)	5 items; 3 levels, 1 item; 0–100 VAS	Index (0–1*) VAS score (0–100*)

Summary scores were calculated using the guideline of each corresponding questionnaire. Normative Dutch values of the EQ-5D-5L were used to calculate the EQ-5D-5L index scores, and normative values of the EQ-5D-3L were used to calculate the EQ-5D-Youth index scores.

T-score: 50 points equal to mean score of the reference population and −10 equal to the mean score of −1 SD compared with reference.

*Indicates best outcome score.

EQ-5D-3L, EuroQol-5-dimension 3-level questionnaire; EQ-5D-5L, EuroQol-5-dimension 5-level questionnaire; 5L, 5-level; LEFS, Lower Extremity Functional Scale; MCID, minimal clinically important difference; 5P, 5-point; PROMIS, Patient-Reported Outcomes Measurement Information System; QoL, quality of life; QuickDASH, Shortened Version of the Disabilities of the Arm, Shoulder and Hand; SF, Short Form; UE, upper extremity; VAS, Visual Analog Scale.