Table 3.
Number of studies meeting each single quality criterion for process research (n=25).
| Criterion | DHIPSYa, n (%) | DHIHPb, n (%) | Overall, n (%) |
| Randomized controlled trial | 12 (48) | 12 (48) | 24 (96) |
| CGc | 12 (48) | 12 (48) | 24 (96) |
| Theoretical foundation | 11 (44) | 12 (48) | 23 (92) |
| n≥40 (for CG and EGd each) | 7 (28) | 10 (40) | 17 (68) |
| Evaluation of various mediators | 6 (24) | 3 (12) | 9 (36) |
| Time sequence or temporality | 1 (4) | 0 (0) | 1 (4) |
| Manipulation of mediators | 2 (8) | 0 (0) | 2 (8) |
| P<.05 | 13 (52) | 12 (48) | 25 (100) |
aDHIPSY: digital health interventions with a psychotherapeutic focus.
bDHIHP: digital health interventions with a focus on health promotion.
cCG: control group.
dEG: experimental group.