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Table 3 Research outcomes and internal consistencies

From: Improving body image at scale among Brazilian adolescents: study protocol for the co-creation and randomised trial evaluation of a chatbot intervention

Demographics Age, gender identity, ethnicity, race, state and region of residence T1
Primary outcomes
 State body satisfaction A single 11-point scale assessing the immediate impact of a chatbot technique on participants’ state body satisfaction (How satisfied are you with your appearance, right now, in this moment?).
Total score range 0 (not at all) to 10 (very much). Higher scores reflect greater satisfaction.
Start of chatbot experience.
Post-intervention technique.
12-, 16-, 23.5-h after non-engagement.
 Trait body satisfaction Body Esteem Scale for Adolescents & Adults in Brazil [46, 47].
Appearance Positive (AP; e.g., I like how I look like in photos), Appearance Negative (AN; e.g., I feel ashamed about my appearance) and Weight (e.g., I am satisfied with my weight).
Mean subscale scores range between 0 (never) and 5 (always). Higher scores reflect higher esteem. Internal consistency: AP = .85; AN = .88; Weight = .89.
T1- T4
Secondary outcomes
 State affect A single 11-point scale assessing the immediate impact of a chatbot technique on participants’ state affect (How happy are you, right now, in this moment?).
Total score range between 0 (not at all) to 10 (very much). Higher scores reflect greater positive affect.
Start of chatbot experience.
Post intervention technique.
12-, 16-, 23.5-h after non-engagement.
 Trait affect The Positive and Negative Affect Scale for Children 8-item; PANAS-C8 [48]
8-items related to emotive states (4 positive [e.g., joyful]; 4 negative [e.g., irritated]).
Positive and negative affect subscale scores range between 1 (not at all) and 5 (extremely). Higher scores reflect greater positive or negative affect. Internal consistency: PA = .77; NA = .76
T1 - T4
 Trait body image self- efficacy A purpose-built measure, The Body Image Self-Efficacy Scale, derived from existing self-efficacy measures [49,50,51].
5 visual analogue scales (VAS; 0 [not at all confident] to 100 [very confident]) assessing participants’ belief in their ability to execute strategies to improve their body image (e.g., I am able to learn and practice new skills to help improve my body image).
Total mean scores range between 0 and 100. Higher scores reflect greater body image self-efficacy. Internal consistency: .82
T1 - T4
 Intervention adherence Digital metrics will assess participants engagement with the chatbot, including:
• Percentage of participants who complete the intervention (e.g., minimum of 1 technique completed over the 72-h intervention period);
• Percentage of participants who enter the intervention but do not complete the intervention;
• Percentage of participants who complete each intervention technique;
• Average number of techniques completed;
• Average length of time taken to complete each technique;
• Average length of time spent engaging with the chatbot over the 72-h period.
72-Hour Intervention Period
 Intervention acceptability 11 items assessed participants acceptability of the chatbot. Factors included:
• Emotive response to the chatbot (e.g., enjoyment, interest, comfortability);
• Relevance (e.g., pertinence, importance and helpfulness of the content to the user and other young people in Brazil);
• Ease of use (e.g., speed and accuracy of responses); and
• Willingness to recommend (e.g., how likely the user would recommend Topity to a friend and re-engage in the future).
Item scores range between 1 (e.g., not at all enjoyable) and 7 (e.g., very enjoyable). Higher scores reflect greater acceptability.
T4
  1. Note. T1 = Baseline; T1 = Baseline; T2 = Post-intervention; T3 = One-Week Follow-Up; T4 = One-Month Follow-up