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Table 2 Description and psychometric properties of measures of behavioural and involuntariness responses to hypnotic suggestions

From: Hypnotherapy for procedural pain, itch, and state anxiety in children with acute burns: a feasibility and acceptability study protocol

Measurement Goal Description Score ranges Scoring Duration Time point Psychometric properties
Standard SHCS: CHILD form [37] To measure behavioural responses to hypnotic suggestions for children aged 6–16 years - Relaxation/eye closure induction;
- 7 test suggestions for time regression, visualisation, ideomotor responses, and post-hypnotic suggestions to re-enter hypnosis at hand clapa
0–7:
- Low: 0–2;
- Medium: 3–5;
- High: 6–7
- 0 if absent or negative behavioural response,
- 1 if positive behavioural response [37]
20 mins Just before and during the 1st dressing change - Moderate correlation with the Stanford Hypnotic Susceptibility, Form A scale: r = 0.67 [37]
- Established concurrent validity [37]
Modified SHCS: CHILD form [37] To measure behavioural responses to hypnotic suggestions for children aged 4–8 years - Active induction in which eyes can be open;
- 6 test suggestions for time regression, visualisation, and ideomotor responses
0–6:
- Low: 0–1;
- Medium: 2–4;
- High: 5–6
Involuntariness numeric scale [39] To rate involuntariness and automaticity experienced during the responses to SHCS: CHILD suggestions Age-appropriate question reworded to children’s age regarding experienced involuntariness during responses to SHCS: CHILD items (did that feel like you made that happen or that it happened by itself?)b Mean of items scores Score ranging from 0 (no response), 1 (voluntary response to suggestions) to 5 (involuntary-automatic enactment) for each SHCS: CHILD test item 10 mins During the 1st dressing change - Good internal consistency (αs: 0.76–0.86) [40]
- Adequate construct validity: moderate correlation of involuntariness scores with scores on a standardised hypnotic suggestibility scale (r = .49, p < .001, 95% CI = [.31, .65], n  = 58) [41]
  1. aAnaesthesia suggestion will be incorporated in the ideosensory test suggestion to assess specific responses relevant to hypno-anaesthesia
  2. bFollowing each test suggestion, children will be asked about the involuntariness experienced during responses to test suggestions