Table 3.
Characteristics of phase 2 studies (N=42).
| Characteristics | Phase 2 studies, n (%) | |
| Number of surveyed studies or apps | ||
|
|
iOS | 21 (50) |
|
|
Android | 21 (50) |
| Roles of MLa | ||
|
|
Recognition, monitoring, and personalization | 6 (14) |
|
|
Monitoring and personalization | 6 (14) |
|
|
Recognition | 2 (5) |
| Processing techniques | ||
|
|
Calculation | 22 (52) |
|
|
Calculation and data | 8 (19) |
|
|
Calculation, data, and image | 6 (14) |
|
|
Voice | 2 (5) |
| Focus | ||
|
|
Physical health | 16 (38) |
|
|
Weight control | 12 (29) |
|
|
Women’s health | 6 (14) |
|
|
Sleep | 6 (14) |
|
|
Behavior change | 2 (5) |
| Crucial functionalities | ||
|
|
Monitoring | 22 (52) |
|
|
Recognition, monitoring, and personalization | 6 (14) |
|
|
Monitoring and personalization | 6 (14) |
|
|
Recognition | 2 (5) |
| UIb components | ||
|
|
Label | 42 (100) |
|
|
Image | 42 (100 |
|
|
Button | 42 (100) |
|
|
List | 42 (100) |
|
|
Scroll bar | 42 (100) |
|
|
Input box | 34 (81) |
| Navigation and structure | ||
|
|
Tab (iOS) | 18 (43) |
|
|
Tab (Android) | 17 (40) |
|
|
Main page and hamburger menu (Android) | 3 (7) |
|
|
Tab and hamburger menu (iOS) | 2 (5) |
|
|
Main page and hamburger menu (iOS) | 1 (2) |
|
|
Main page (Android) | 1 (2) |
| Services and technologies | ||
|
|
Camera | 20 (48) |
|
|
GPS | 26 (62) |
|
|
Motion sensors | 7 (17) |
|
|
Microphone | 4 (10) |
| Security features | ||
|
|
Log-in | 40 (95) |
| Logging mechanisms | ||
|
|
Manual | 26 (62) |
|
|
Automatic | 10 (24) |
|
|
Both | 6 (14) |
| Evaluation | ||
|
|
MARSc | 42 (100) |
aML: machine learning.
bUI: user interface.
cMARS: Mobile App Rating Scale.