Table 3.
Final model for associations between PTSD symptoms and cannabis use by race and ethnic minority status
| Race or ethnic minority (n = 1,135) | Non-Hispanic White (n = 319) | |||
|---|---|---|---|---|
|
| ||||
| Effect | Early young adulthood | Late young adulthood | Early young adulthood | Late young adulthood |
|
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| Within-Person Cross-Lags | B [95% CI] | B [95% CI] | ||
|
| ||||
| Can Uset+1 on PTSDt | 0.35 [0.05, 0.65] | 0.33 [0.01, 0.66] | 0.40 [−0.20, 0.99] | −0.53 [−1.22, 0.15] |
| PTSDt+1 on Can Uset | 0.03 [0.01, 0.06] | 0.05 [0.02, 0.07] | −0.01 [−0.05, 0.03] | 0.01 [−0.03, 0.06] |
|
| ||||
| Auto-Regressive | B [95% CI] | B [95% CI] | ||
|
| ||||
| Can Uset+1on Can Uset | 0.36 [0.29, 0.43] | 0.33 [0.24, 0.42] | 0.44 [0.31, 0.57] | 0.21 [0.06, 0.36] |
| PTSDt+1on PTSDt | 0.18 [0.06, 0.30] | 0.22 [0.08, 0.36] | 0.16 [−0.09, .41] | 0.11 [−0.13, 0.34] |
|
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| Co-Variances (between-person) | r (se) | r (se) | ||
|
| ||||
| Can Useint with PTSDint | −0.31 (0.26) | −0.12 (0.23) | ||
| Can Useint with PTSDslp | 0.46 (0.43) | 0.25 (0.25) | ||
| PTSDint with Can Useslp | 0.21 (0.32) | 0.13 (0.28) | ||
| Can Useslp with PTSDslp | −0.07 (0.04) | 0.04 (0.31) | ||
|
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| Mean intercept and slope | B [95% CI] | B [95% CI] | ||
|
| ||||
| Can Useint | 6.60 [5.08, 8.11] | 11.8 [8.56, 14.9] | ||
| PTSDint | 1.52 [0.98, 2.05] | 0.99 [0.06, 1.92] | ||
| Can Useslp | 0.35 [0.03, 0.66] | −0.60 [−1.20, −0.01] | ||
| PTSDslp | −0.09 [−0.22, 0.45] | −0.05 [−0.27, 0.17] | ||
|
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| Variance intercept and slope | B [95% CI] | B [95% CI] | ||
|
| ||||
| Can Useint | 12.2 [4.70, 19.7] | 33.9 [13.9, 53.9] | ||
| PTSDint | 1.05 [0.33, 1.78] | 1.79 [0.59, 3.00] | ||
| Can Useslp | 0.06 [−0.27, 0.40] | 0.71 [0.06, 1.37] | ||
| PTSDslp | 0.20 [−0.02, 0.06] | 0.07 [0.01, 0.12] | ||
|
| ||||
| Residual (Co) Variances | B [95% CI] | B [95% CI] | ||
|
| ||||
| Can UseЄit18–Єit26 | 28.6 [26.4, 30.9] | 25.0 [22.9, 27.2] | 25.4 [21.6, 29.2] | 22.3 [18.9, 25.7] |
| PTSDЄit18–Єit26 | 1.92 [1.67, 2.18] | 2.08 [1.81, 2.34] | 1.66 [1.25, 2.06] | 1.47 [1.14, 1.80] |
|
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| Fit Statistics | ||||
|
| ||||
| AIC | 65822.1 | 18812.3 | ||
| BIC | 66088.9 | 19011.8 | ||
| RMSEAd | 0.03 | 0.05 | ||
| SRMRe | 0.09 | 0.17 | ||
| CFIf | 0.96 | 0.91 | ||
Note: Estimates for all control variables on all latent intercept, and linear growth parameters, are not shown for readability. Can Use = Frequency of cannabis use; PTSD = post-traumatic stress disorder. In the table above, subscripts identify time of measurement. For example, a single t indicates paths were constrained to be equal over time. Subscript int indicates latent intercept (mean level) to obtain between-person parameter estimates. Subscripts with an epsilon (Єit) indicate residual variance measured over time.
RMSEA (Root Mean Square Error) indices below .05 are considered to be representative of good model fit
SRMR (Standardized Root Mean Square Residual) indices below .08 are considered to be representative of good model fit
CFI (Comparative Fit Index) scores above .90 are indicative of good model fit.
df = degrees of freedom.
Bold indicates confidence interval does not include 0