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Table 1 Details of studies included in review

From: The effect of commitment-making on weight loss and behaviour change in adults with obesity/overweight; a systematic review

Study ID (country) N (gender) Weight status Setting Intervention format Intervention length Deliverer Comparison Deposit/ Fee
Balk-Møller 2017 a [38] (Denmark) 269 (92% female) Mean waist circumference 92 cm Workplace Individual / Workplace team 38 weeks Web and App D/PA + pledge vs NTC None
Black b 1983 [43](USA) 36 (females) 37% mean overweight** Community Couple / Individual 10 weeks HCP + DS D/PA + BC with varying husband involvement $11 deposit refunded on attendance
Clifford 1991 a [36] (USA) 48 (completed 17 female 17 male) 84% had BMI ≥ 25 Community Group + individual /peer support 52 weeks HCP/ YMCA director D/PA + BC vs NTC $50 NR deposit $195 course fee
Craighead 1989a [45] (USA) 62 Female 15-45lbs overweight Community Group information + supervised/contracted exercise 12 weeks DS D/PA + contract vs contract only $10 deposit refunded at end of treatment
Dubbert b 1984 [46] (USA) 62 (48 female,14 male) Min 15lbs, max 100% overweight* Community Group + Couple/Group + Individual 19 weeks HCP D/PA + spouse BC vs D/PA, proximal or distal goals. $65 deposit ($15 refundable) Cost for couples.
Franzini 1980a [42] (USA) 76 (70 female, 6 male) 37% mean overweight** (10.4–87.7%) Community Group 11 weeks HCP + GS D/PA + BC vs D/PA vs WLC £5 cost for materials
Kegler a 2016 [41] (USA) 349 (female only) BMI 38.3 (mean) Home Individual + telephone support./ 3 mail information 16 weeks Non-HCP D/PA + BC vs IO None
Maruyama 2010 a [40] (Japan) 101 (male only) BMI 25.8 (mean) Workplace Individual + Web support 16 weeks HCP D/PA + BC vs NTC None
Nyer a,b 2010 [39] (India) 211 (female only) 15-20lbs* overweight (20lbs max) Community Group 16 weeks HCP D/PA + BC conditions vs D/PA Not stated
Ureda b 1980 [44] (USA) 106 (not reported) 34.5 lbs. (median) Community Group 4 weeks Not reported D/PA + BCW vs D/PA + BC None
  1. acommitment vs control study, bcommitment vs different contract study. HCP Healthcare Professional, GS Graduate student, DS Doctoral student, D Dietary intervention, PA Physical activity intervention, WLC Waiting list control, NTC No treatment control, IO Information only, BCW Behavioural contract witnessing BC Behavioural contract