Number of weighed controls and not-weighed cases per substance & associated odds ratio.

Legend: ns = not statistically significant; adjusted odds ratioo: after removal of missing data for gender, age, & time period; †: 1 observation was added to each of the four cells; Alcohol & Sedatives ( = Alcohol +: THC, Benzodiazepines, THC & Benzodiazepines, Benzodiazepines & Z-drugs, Medicinal opiates), Alcohol and Stimulants ( = Alcohol +: Amphetamines, Benzoylecgonine, Cocaine, Amphetamines & Cocaine) Multiple Sedatives (Benzodiazepine & Z-drugs, THC & Medicinal Opiates, Benzodiazepines & Medicinal Opiates) and Stimulants & Sedatives (Benzoylecgonine & THC, Amphetamines & Benzoylecgonine & THC, Amphetamines & Cocaine & THC, Amphetamines & THC & Benzodiazepines, Benzoylecgonine & Medicinal Opiates).