. Author manuscript; available in PMC: 2019 Dec 31.

Published in final edited form as: Alcohol Clin Exp Res. 2016 Jul 18;40(9):1953–1960. doi: 10.1111/acer.13149

Table 1.

Principal Component Analysis (PCA) of 27,736 Multiple DUI Offenders in the Florida Ignition Interlock Program who Installed Interlocks Between October 2008 and December 30, 2012

Component 1: Prior Record Prior drinking and driving behavior		Component 2: Interlock Record on interlock drinking and driving behavior
Variable	Loading	Variable	Loading
Prior DUIs	0.764	All lockouts	0.925
Interlock sentence	0.784	Morning lockouts	0.842
Arrest BAC^a	0.300^a	Violations	0.710
County arrest rates (SES)	0.254	Max BAC (Interlock)	0.723

BAC, blood alcohol concentration; DUI, driving under the influence; SES, socioeconomic status.

Subjects missing arrest BACs were imputed as having the population average BAC (using mean-substitution) while using the other measures for computing their component factor scores.