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All tested combinations of the 3 intervention enhancement strategies.
| Combinations | Experimental factors | ||
|
|
Texting | Gifts | Ketone measurement |
| 1 | Texts | Gifts | Urine |
| 2 | Texts | Gifts | Breath |
| 3 | Texts | No gifts | Urine |
| 4 | Texts | No gifts | Breath |
| 5 | No texts | Gifts | Urine |
| 6 | No texts | Gifts | Breath |
| 7 | No texts | No gifts | Urine |
| 8 | No texts | No gifts | Breath |
