Table 2 Odds ratios for bullying witnessing
| Â | Bullying witnessing (never versus sometimes) | Bullying witnessing (never versus often) | ||||
|---|---|---|---|---|---|---|
Odds Ratios | S.E. | 95% CI | Odds Ratios | S.E. | 95% CI | |
Intercepts | .29* | .23 | (.18, .46) | .11* | .35 | (.06, .22) |
Single child or not | ||||||
 No | .93 | .06 | (.89,1.12) | 1.15 | .09 | (.92,1.35) |
 Yes (reference) |  |  |  |  |  |  |
Local residents or not | ||||||
 No | .99 | .06 | (.89, 1.12) | .1.13 | .09 | (.93, 1.37) |
 Yes (reference) |  |  |  |  |  |  |
Family economic status | ||||||
 Living in a rented house | .94 | .05 | (.81,.1.09) | .84 | .12 | (.66,1.07) |
 Living in an owned house (reference) |  |  |  |  |  |  |
Living arrangement | ||||||
 Living with grandparents | 1.35 | .19 | (.93, 1.96) | .99 | .28 | (.56,1.74) |
 Living with parents (reference) |  |  |  |  |  |  |
Urban/rural hukou | ||||||
 Rural | 1.02 | .07 | (.88.1.16) | 1.35* | .12 | (1.09,1.68) |
 Urban (reference) |  |  |  |  |  |  |
Parental education level | ||||||
 Middle school or lower | 1.08 | .09 | (.83,1.42) | 1.20 | .08 | (.94, 1.41) |
 Bachelor’s or higher (reference) |  |  |  |  |  |  |
Maternal education level | ||||||
 Middle school or lower | .86 | .08 | (.72,1.02) | .87 | .02 | (.66,1.15) |
 Bachelor’s or higher (reference) |  |  |  |  |  |  |