Table 2.
Balancing statistics on relevant covariates for the natural experiment. Covariates with absolute SMD lower than 0.25 are considered balanced (e.g., [48]). NA refers to missingness indicator. #Days on social network refers to the number of days between the first created edge and the friendship request.
| Group | Variable | SMD |
|---|---|---|
| Sender | Age | 0.092 |
| Age NA | 0.071 | |
| Gender | 0.115 | |
| Gender NA | 0.105 | |
| BMI | 0.052 | |
| BMI NA | −0.013 | |
| Steps 7 days before | 0.034 | |
| Days tracked 7 days before | −0.005 | |
| Receiver | Age | −0.004 |
| Age NA | −0.061 | |
| Gender | −0.026 | |
| Gender NA | −0.028 | |
| BMI | −0.034 | |
| BMI NA | −0.065 | |
| Steps 7 days before | 0.074 | |
| Steps 7 days before NA | −0.002 | |
| Days tracked 7 days before | −0.014 | |
| Relationship Timing | #Mutual friends at request | 0.080 |
| Edge number for sender | 0.049 | |
| Edge number for receiver | 0.098 | |
| #Days on social network for sender | 0.109 | |
| #Days on social network for receiver | 0.179 | |
|
| ||
| Median Absolute SMD | 0.057 | |
| Maximum Absolute SMD | 0.179 | |