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. Author manuscript; available in PMC: 2020 Aug 28.
Published in final edited form as: Addict Behav. 2019 May 8;97:35–41. doi: 10.1016/j.addbeh.2019.05.005

Table 3.

Piecewise model parameters (N = 44).

Fixed slope15, Fixed slope512, Model Random slope15, Random slope512, Model
(Time 0 = Occasion 1) (Time 0 = Occasion 1)
Model parameters Estimate SE p Estimate SE p
Fixed effects:
Intercept 5.36 0.60 0.000 5.35 0.70 0.000
Slope15 −0.31 0.14 0.026 −0.28 0.20 0.179
Slope512 −0.19 0.07 0.008 −0.21 0.10 0.044
Variance components:
Intercept variance 7.99 1.96 0.000 11.77 3.99 0.003
Residual variance 8.25 0.62 0.000 6.41 0.53 0.000
Intercept-Slope15 covariance - - - −1.47 1.03 0.152
Linear Slope15/time variance - - - 0.92 0.40 0.021
Intercept-Slope512 covariance - - - −0.11 0.51 0.822
Slope 15–512 covariance - - - −0.30 0.16 0.065
Linear Slope512 variance - - - 0.23 0.09 0.013
REML model fit:
-2LL 2080.1 2047.8
AIC 2084.1 2061.8
BIC 2092.0 2089.7
Number of parameters 5 10

Bolded numbers are statistically significant parameters with p < 0.05