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Table 3 Fixed effects regression of the Cannabis withdrawal symptoms

From: Time-course of the DSM-5 cannabis withdrawal symptoms in poly-substance abusers

  Model 1    Model 2   
  Coef. SE P-value Coef. SE P-value
Days since last cannabis use -0.130 0.035 0.000 0.051 0.053 0.339
Days since last alcohol or benzodiazepine use -0.070 0.044 0.117 -0.031 0.048 0.523
Days since last opioid use 0.051 0.054 0.346 -0.061 0.044 0.175
Days since last CS use -0.037 0.048 0.441 0.076 0.135 0.576
Days since last cannabis use squared Not included    -0.006 0.004 0.118
Constant 11.731 1.174 0.000 10.147 1.527 0.000
Rho 0.641   0.000 0.589   0.000
  1. Notes: CS: Central stimulants. Model 1: linear model. Model 2: quadratic model.