Table 2.
Results of weighted multiple linear regression models for three outcome variables of interest
| Independent Variables and Effects | Model 1: age of first concern (months) | Model 2: age of final diagnosis (months) | Model 3: wait time (months) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Beta Coeff | SE Beta | p-value (B = 0) | Beta Coeff | SE Beta | p-value (B = 0) | Beta Coeff | SE Beta | p-value (B = 0) | |
| Intercept | 85.06 | 14.79 | < .001 | 97.17 | 11.33 | < .001 | − 0.86 | 13.03 | 0.95 |
| Diagnostic group | |||||||||
| ASD | − 51.47 | 15.10 | < .001 | − 44.98 | 14.80 | < .001 | 6.81 | 11.21 | 0.54 |
| ASD + ADHD | < .001 | < .001 | < .001 | < .001 | < .001 | < .001 | |||
| Race/Ethnicity | |||||||||
| White Non-Hispanic | < .001 | < .001 | < .001 | < .001 | < .001 | < .001 | |||
| Black Non-Hispanic | − 7.49 | 6.05 | 0.22 | − 10.49 | 5.34 | 0.05 | − 21.97 | 7.03 | < .001 |
| Hispanic | 4.65 | 6.75 | 0.49 | − 0.31 | 6.00 | 0.96 | 1.12 | 5.61 | 0.84 |
| Other | − 6.52 | 8.84 | 0.46 | 4.87 | 8.50 | 0.57 | 24.79 | 16.48 | 0.13 |
| Poverty Level | |||||||||
| < 100%PL | < .001 | < .001 | |||||||
| 100%−199% PL | − 1.50 | 5.59 | 0.79 | ||||||
| 200%−399% PL | 0.08 | 4.89 | 0.99 | ||||||
| 400% + PL | 8.29 | 5.31 | 0.12 | ||||||
| Diagnostic Group X Race/Ethnicity Interaction | |||||||||
| ASD, WNH | < .001 | < .001 | |||||||
| ASD, BNH | 25.83 | 9.35 | 0.01 | ||||||
| ASD, Hispanic | 4.64 | 9.78 | 0.64 | ||||||
| ASD, Other | 24.7 | 11.06 | 0.03 | ||||||
| ASD + ADHD, WNH | < .001 | < .001 | |||||||
| ASD + ADHD, BNH | < .001 | < .001 | |||||||
| ASD + ADHD, Hispanic | < .001 | < .001 | |||||||
| ASD + ADHD, Other | < .001 | < .001 | |||||||
| Relationship of first concerned person to child | |||||||||
| Family | − 33.95 | 13.45 | 0.01 | − 27.98 | 9.89 | < .001 | 3.88 | 6.80 | 0.57 |
| Other | < .001 | < .001 | < .001 | < .001 | < .001 | < .001 | |||
| Diagnostic group, relationship | |||||||||
| ASD, Family | 40.69 | 15.31 | 0.01 | 39.01 | 15.14 | 0.01 | |||
| ASD, Other | < .001 | < .001 | < .001 | < .001 | |||||
| ASD + ADHD, Family | < .001 | < .001 | < .001 | < .001 | |||||
| ASD + ADHD, Other | < .001 | < .001 | < .001 | < .001 | |||||
| Behavioral problems | |||||||||
| None | < .001 | < .001 | < .001 | < .001 | < .001 | < .001 | |||
| Current or Prior | − 14.42 | 4.04 | < .001 | − 18.07 | 4.18 | < .001 | − 4.91 | 6.74 | 0.47 |
| Developmental disability | |||||||||
| None | < .001 | < .001 | < .001 | < .001 | |||||
| Current or prior | − 4.1 | 4.36 | 0.35 | − 7.05 | 4.18 | 0.09 | |||
| Intellectual disability | |||||||||
| None | < .001 | < .001 | < .001 | < .001 | |||||
| Current or prior | 7.85 | 5.17 | 0.13 | 7.41 | 5.47 | 0.18 | |||
| Anxiety | |||||||||
| None | < .001 | < .001 | < .001 | < .001 | |||||
| Current or prior | 9.04 | 3.95 | 0.02 | − 0.52 | 5.68 | 0.93 | |||
| Depression | |||||||||
| None | < .001 | < .001 | < .001 | < .001 | < .001 | < .001 | |||
| Current or prior | 10.96 | 4.95 | 0.03 | 13.59 | 4.52 | < .001 | 19.43 | 5.48 | < .001 |
| Intervention | |||||||||
| None | < .001 | < .001 | < .001 | < .001 | |||||
| Intervention | − 8.66 | 5.64 | 0.12 | 15.8 | 5.81 | 0.01 | |||
Because wait time is calculated as a difference score between age of first concern and age of diagnosis, and because the effect of poverty level on age of diagnosis was nonsignificant in the second model, we did not include poverty level in the third model