There is an error in the footnote of Table 1. “Increase from baseline to end of Phase 1 within group, p < 0.03” should be corrected to “Increase from baseline to end of Phase 1 within group, p<0.05”. Please see the correct Table 1 here.
Table 1. Clinical and physiological characteristics at baseline, changes at the end of Phase 1, and exercise performance in Phase 1.
| Standard Group | Incentive Group | |||
|---|---|---|---|---|
| Baseline | Change at End of Phase | Baseline | Change at End of Phase | |
| BMI, kg/m2* | 34.9 ± 8.5 | 0.7 ± 1.1† | 34.7 ± 6.2 | 0.7 ± 1.8† |
| BMI, percentile | 98 ± 3 | 0 ± 1 | 98 ± 3 | 0 ± 1 |
| Body fat, % | 43.6 ± 8.1 | 0.9 ± 2.7 | 43.1 ± 6.9 | 0.1 ± 4.2 |
| Fat-free mass, kg | 48.6 ± 10.2 | 0.6 ± 2.9 | 52.2 ± 10.2 | 0.9 ± 4.3 |
| Waist circumference, cm | 104 ± 16 | -1 ± 5 | 108 ± 12 | 0 ± 8 |
| VO2peak, ml/kg FFM/min* | 34.2 ± 7.1 | 3.4 ± 5.7† | 35.2 ± 8.7 | 3.7 ± 7.5† |
| Steps per day | 6,404 ± 3,425 | -869 ± 2,318 | 6,218 ± 2,419 | 483 ± 3,401 |
| Glucose, mmol/l | 5.3 ± 0.5 | 0.2 ± 1.0 | 5.1 ± 0.4 | 0.4 ± 2.1 |
| Insulin, pmol/l | 164.7 ± 229.3 | -2.9 ± 166.9 | 119.7 ± 94.3 | -11.4 ± 80.3 |
| iHOMA2 (%S) | 74.9 ± 48.5 | -13.8 ± 40.7 | 68.6 ± 44.2 | -4.9 ± 26.2 |
| HbA1c (%) | 5.4 ± 0.3 | 0.1 ± 0.2† | 5.3 ± 0.2 | 0.1 ± 0.6 |
| Exercise sessions performed | — | 26 ± 16 | — | 28 ± 15 |
| Total MVPA time, h | — | 15.2 ± 10.1 | — | 15.0 ± 8.1 |
| MVPA time per exercise session, minutes | — | 35 ± 7 | — | 32 ± 8 |
| MVPA time in moderate intensity range, % | — | 63 ± 18 | — | 64 ± 18 |
| Payments for exercise, USD$ | — | 99 ± 58 | — | 245 ± 144§ |
Values shown as mean ± SD. BMI, body mass index; VO2peak, peak oxygen uptake during aerobic fitness test; FFM, fat-free mass; iHOMA2, integrated homeostatic model of assessment; HbA1c, hemoglobin A1c; MVPA, moderate-to-vigorous activity. The Standard group had 18 girls, 17 boys; mean age 14.2 ± 2.4 years at baseline.
The Incentive group had 25 girls, 17 boys; mean age 14.4 ± 2.3 years at baseline.
* Main effect of time for entire cohort, p < 0.01.
† Increase from baseline to end of Phase 1 within group, p < 0.05.
§ Difference between groups, p < 0.01.
Reference
- 1.Short KR, Chadwick JQ, Cannady TK, Branam DE, Wharton DF, Tullier MA, et al. (2018) Using financial incentives to promote physical activity in American Indian adolescents: A randomized controlled trial. PLoS ONE 13(6): e0198390 10.1371/journal.pone.0198390 [DOI] [PMC free article] [PubMed] [Google Scholar]