Table 2.
Variables description and data statistics.
| Model Variable | Measurement | Description | Mean | Min | Max | Std. Dev. |
|---|---|---|---|---|---|---|
| Behavior | DietNum | Number of diet diaries at week t | 0.643 | 0 | 7 | 1.760 |
| ExerNum | Number of exercise diaries at week t | 0.348 | 0 | 7 | 1.321 | |
| Social integration | FNum | Number of friends at week t-1 | 1.690 | 0 | 437 | 6.223 |
| Fnum3M | Number of friendships established for no more than three months at week t-1 | 1.586 | 0 | 136 | 5.651 | |
| SpNum | Number of support groups at week t-1 | 0.827 | 0 | 21 | 1.528 | |
| SpNum3M | Number of support groups, no more than three months at week t-1 | 0.126 | 0 | 17 | 0.550 | |
| ChalNum | Number of challenges group at week t-1 | 0.122 | 0 | 35 | 0.522 | |
| Social norm | FDietNum | Average diet diary number of friends at week t-1 | 1.008 | 0 | 190 | 5.372 |
| FDietNum3M | Average diet diary number of no more than three months friends at week t-1 | 0.994 | 0 | 145 | 3.409 | |
| FExerNum | Average exercise diary number of no more than three months friends at week t-1 | 0.563 | 0 | 117 | 3.362 | |
| FExerNum3M | Average exercise diary number of friends at week t-1 | 0.725 | 0 | 92 | 2.775 | |
| SpDietNum | Average diet diary number of group at week t-1 | 283.742 | 0 | 8429 | 529.665 | |
| SpDietNum3M | Average diet diary number of group participating for no more than three months at week t-1 | 44.825 | 0 | 5392 | 205.432 | |
| SpExerNum | Average exercise diary number of support group at week t-1 | 160.721 | 0 | 5197 | 305.888 | |
| SpExerNum3M | Average exercise diary number of support group participating for no more than three months at week t-1 | 25.505 | 0 | 3443 | 118.537 | |
| ChalDietNum | Diet diary number of challenge members at week t-1 | 18.153 | 0 | 3392 | 90.630 | |
| ChalExerNum | Average exercise diary number of challenge members at week t-1 | 11.430 | 0 | 2238 | 57.849 | |
| Social support | CompSp | Companionship support at week t-1 | 0.002 | 0 | 11.54 | 0.059 |
| EmotSp | Emotional Support at week t-1 | 0.009 | 0 | 34.847 | 0.172 | |
| InfoSp | Informational Support at week t-1 | 0.012 | 0 | 50.217 | 0.297 | |
| Member | InitWeight | The last weight input before 2011.1.2 | 90.578 | 100 | 244.9 | 23.507 |
| ExpLossRatio | Expectation loss ratio a | 19.164 | 0.088 | 67 | 11.287 | |
| Membership | Months since participated OHC until week t | 12.545 | 0.267 | 62.233 | 9.769 | |
| DietChangeTs | Number of diet changes until week t | 1.159 | 1 | 7 | 0.466 |
Note. a Expectation loss ratio is calculated by 100% * (Weight_Start-Weight_Goal)/Weight_Start, the Weight_Start is the users’ weight at the beginning, and the Weight_Goal is the user’s expected weight.