Table 3. Age group-specific acceptance of nutrition and fitness apps (middle-aged/older adults vs. younger adults).
| Acceptance of nutrition apps (n) | Acceptance of fitness apps (f) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| I. (n) usage | II. (n) | I. (f) usage | II. (f) | ||||||||
| attitudes | attitudes | ||||||||||
| II.I (n) perceived usefulness | II.II (n) ease of use | II.III (n) interest/ desirability | II.IV (n) privacy concern | II.I (f) perceived usefulness | II.II (f) ease of use | II.III (f) interest/ desirability | II.IV(f) privacy concern | I.V(f) reason for usage | |||
| [54] | X | − | − | − | X | ↓* | − | − | − | X | − |
| [56] | X | − | − | ↓* | − | ↓* | − | − | ↓* | − | − |
| [51] | X | ↓* | ↓* | − | ↑* | − | ↓* | ↓* | − | ↑* | − |
| [52] | ↓* | − | − | − | − | ↓* | − | − | − | − | − |
| [57] | − | − | − | − | − | ↓* | − | − | − | − | documentation for physician ↑* |
| PA tracking ↓* | |||||||||||
− not examined or reported; X no (significant) age groups differences examined /found; ↓ lower likelihood for older adults, ↑ higher likelihood for older adults; *significant effect(s); PA = physical activity. Note: age effects illustrated here are based on different definitions and operationalizations of middle aged and older age (see Table 2).