Supplementary Table 1. Model fit indices for each of the models examining covariation in symptoms of depression and anxiety.

GAD / c2 / p value / df / BIC / CFI / RMSEA
Parallel process growth curve model / 62.32 / 0.000 / 7 / 37659.75 / 0.93 / 0.075
Auto-regressive cross-lagged model / 30.84 / 0.000 / 4 / 37653.36 / 0.96 / 0.070
AR Model with covariates / 58.87 / 0.000 / 10 / 43917.65 / 0.95 / 0.058
ALT Model / 4.90 / 0.298 / 4 / 37610.57 / 0.99 / 0.013
ALT Model with covariates / 15.53 / 0.361 / 14 / 43937.58 / 0.99 / 0.008
Social Anxiety
Parallel process growth curve model / 67.05 / 0.000 / 7 / 37341.96 / 0.93 / 0.078
Auto-regressive cross-lagged model / 29.28 / 0.000 / 4 / 37326.48 / 0.97 / 0.067
AR Model with covariates / 39.20 / 0.000 / 10 / 43652.21 / 0.97 / 0.045
ALT Model / 27.29 / 0.000 / 4 / 37305.51 / 0.97 / 0.064
ALT Model with covariates / 26.90 / 0.019 / 14 / 43610.81 / 0.99 / 0.025
Separation Anxiety
Parallel process growth curve model / 71.01 / 0.000 / 7 / 36258.70 / 0.91 / 0.080
Auto-regressive cross-lagged model / 24.92 / 0.000 / 4 / 36220.12 / 0.97 / 0.061
AR Model with covariates / 33.31 / 0.000 / 10 / 42416.55 / 0.98 / 0.040
ALT Model / 27.90 / 0.000 / 4 / 36213.08 / 0.97 / 0.065
ALT Model with covariates / 38.32 / 0.005 / 14 / 42399.31 / 0.98 / 0.035
Physical Symptoms
Parallel process growth curve model / 83.60 / 0.000 / 7 / 37547.79 / 0.92 / 0.088
Auto-regressive cross-lagged model / 29.77 / 0.000 / 4 / 37413.51 / 0.97 / 0.067
AR Model with covariates / 39.34 / 0.000 / 10 / 43518.53 / 0.98 / 0.045
ALT Model / 17.99 / 0.000 / 4 / 37383.39 / 0.99 / 0.050
ALT Model with covariates / 34.56 / 0.002 / 14 / 43487.68 / 0.98 / 0.032

Supplementary Figure 1. GAD and Social anxiety growth over time at mean and high initial levels of depressive symptoms.

Supplementary Figure 2. Prospective effects of depressive trajectory deflections on trajectory deflections in physical anxiety symptoms.