Table 1.

Clinical and behavioral description of the sample.

	ICD- (n = 69)	ICD+ (n = 31)	p-value
Age, years	68.79 ± 7.82	63.55 ± 9.77	0.01
Gender, male (%)	37 (53.6)	17 (54.8)	0.91
Age at PD onset, years	62.5 ± 7.75	57.5 ± 9.52	0.02
Evolution, months	65.6 ± 3.76	77.8 ± 3.87	0.25
UPDRS III	23.4 ± 9.88	19.9 ± 9.65	0.11
H&Y*	2(2-2.5)	2(2-2)	0.06
LEDD, mg	533.1 ± 451.6	702.2 ± 416.9	0.07
Proportion of agonist use (%)	41 (59)	26 (84)	0.02
QUIPs	0.06	1.84	< 0.001
MIDI	0.29	3.3	< 0.001
BIS-11	56.35 ± 7.0	58.33 ± 7.72	0.23
Motor	19.31 ± 2.52	19.37 ± 2.95	0.93
Nonplanning	20.79 ± 4.07	22.23 ± 4.7	0.15
Attentional	16.25 ± 1.98	16.73 ± 1.98	0.27
PCPT commission errors ratio	0.378 ± 0.2	0.376 ± 0.2	0.96
PCPT correct RT, ms	480 ± 75	465 ± 57	0.24
PCPT error RT, ms	447 ± 163	426 ± 131	0.49
PCPT correct targets ratio	0.94	0.95	0.59
Current smokers (%)	3 (4.3)	6 (19)	0.02**
Lifetime smokers (%)	32 (46)	20 (65)	0.93
Age at smoking onset	19.65 ± 4.48	15.53 ± 3.11	< 0.001
Current alcohol users (%)	41 (59)	27 (87)	0.006
Lifetime alcohol users (%)	52 (75)	30 (97)	0.009
Lifetime illegal drugs users (%)	3 (5)	4 (14)	0.20**

Mean ± standard deviation and proportions are shown unless otherwise specified. t-test is used for central measures and Chi-square for proportions unless other test specified.

^*Median (interquartile range), Wilcoxon–Mann–Whitney test significance is shown.

^**Fisher exact test significance is shown.

ICD, impulse control disorder; PD, Parkinson's disease; UPDRS, Unified Parkinson's Disease Rating Scale; H&Y Hoehn and Yahr scale; LEDD, levodopa equivalent daily dose; QUIPs, Short version of Questionnaire for Impulsive-Compulsive Disorders, MIDI, Minnesota Impulsive Disorders Interview; BIS-11, Barrat Impulsiveness Scale; PCPT, PEBL Continuous Performance Task; RT, reaction time; ms, milliseconds.