Table 1.
Summary statistics for all variables.
| Variables | M/% | SD | Min | Max | N |
|---|---|---|---|---|---|
| Community Level | |||||
| Independent Variable | |||||
| Fine particulate matter (㎍/㎥) | 129.98 | 28.03 | 78 | 218 | 79 |
| Standardized fine particulate matter | 0 | 1 | −1.84 | 3.02 | 79 |
| Individual Level | |||||
| Dependent Variable | |||||
| Child's depressive symptoms | 1.91 | 0.62 | 1 | 4 | 4704 |
| Standardized depressive symptoms | 0 | 1 | −1.50 | 3.33 | 4704 |
| Mediator | |||||
| Physical activity (minutes) | 29.23 | 45.38 | 0 | 600 | 4607 |
| Standardized physical activity | 0 | 1 | −0.64 | 12.68 | 4607 |
| Moderator | |||||
| Family poverty | 14% | 4546 | |||
| Covariates | |||||
| Children | |||||
| Girl | 53% | 4704 | |||
| Age | 4704 | ||||
| Elementary school child | 27% | ||||
| Middle school child | 32% | ||||
| High school child | 41% | ||||
| Self-reported grades at school | 5.99 | 2.15 | 1 | 10 | 4582 |
| Primary caregiver | |||||
| Types of primary caregiver | 4704 | ||||
| Mother | 83% | ||||
| Father | 16% | ||||
| Others | 1% | ||||
| Age | 45.49 | 4.66 | 23 | 79 | 4416 |
| Married | 87% | 4704 | |||
| Number of family members | 4.14 | 0.92 | 2 | 15 | 4703 |
| Graduated college | 58% | 4646 | |||
| Homeowner | 67% | 4677 | |||
| Urbanicity | 4704 | ||||
| Live in urban area | 48% | ||||
| Live in suburban area | 37% | ||||
| Live in rural area | 15% | ||||
| Neighborhood poverty rate | 3.66 | 0.68 | 2.10 | 4.65 | 79 |