Table 1.
Descriptive statistics of usage measures in the user groups (N=125).
| Variable | Nonusers (n=17) | Users (n=108) | ||
| Minimal users (n=31) | Low users (n=12) | Intended users (n=65) | ||
| Duration: average login time, mean (SD)a | 3.5 (N/Ab)c | 21.4 (17.9) | 24.4 (13.1) | 32.3 (19.6) |
| Duration: total login time, mean (SD)a | 7.0 (N/A)c | 153.7 (232.5) | 588.8 (404.3) | 1606.3 (1299.9) |
| Frequency: number of logins, mean (SD) | 0.12 (0.49) | 6.6 (6.5) | 24.1 (9.4) | 51.1 (23.1) |
| Activity: emails sent | 0 (N/A) | 3.0 (1.6) | 7.7 (4.6) | 11.6 (5.3) |
| Activity: exercises completedd | 0 (N/A) | 8.6 (6.5) | 36.8 (7.2) | 57.7 (9.2) |
aTime was measured in minutes.
bN/A: not applicable.
cOne participant in the nonuser group logged in twice, but did not complete any of the exercises, therefore belonging to the nonuser group. The duration scores reflect scores of this participant. Standard deviation cannot be calculated for one score.
dAs this variable had a strongly skewed distribution, it was dichotomized (median split) for analysis.