Computational protocol: Illicit Stimulant Use Is Associated with Abnormal Substantia Nigra Morphology in Humans

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Protocol publication

[…] Group data are presented as the mean ± standard deviation (SD). Between-group comparison of subject characteristics (age, height, weight, years of education), neuropsychological parameters, and ultrasound parameters was made with one-way analysis of variance (ANOVA). Non-parametric data were transformed to ranks and ANOVA on ranks were performed. Post-hoc discrimination between means was made with Student-Newman Keuls procedure. Unpaired Student's t-test was used to compare cannabis parameters between the stimulant and cannabis groups. Paired Student's t-test was used to compare lifetime use of ecstasy and amphetamine-like stimulants within the stimulant group. Spearman Rank Order correlation was used to investigate the relationship between area of substantia nigra echogenicity (largest side) and drug-use and neuropsychological parameters (SigmaPlot 11.0, Systat Software Inc, Chicago, USA). Inter-rater reliability was assessed with Cronbach's alpha and Spearmann Rank Order correlation. Inter-rater reproducibility was assessed with the intraclass correlation coefficient (IBM SPSS Statistics Version 20, IBM, Armonk, New York, USA). Comparison of measurements obtained on machine 1 and 2 in the control group was made with unpaired Student's t-test (SigmaPlot 11.0, Systat Software Inc, Chicago, USA). Significance was set at P<0.05. […]

Pipeline specifications

Software tools SigmaPlot, SPSS
Application Miscellaneous
Organisms Homo sapiens
Diseases Marijuana Abuse, Parkinson Disease, Neurotoxicity Syndromes
Chemicals Cocaine, Methamphetamine