Table 4.

Reaction times on CalCAP tasks (milliseconds) in SN, HIV subjects and HIV subjects who used cocaine

Tasks	SN Controls (n=14)	HIV (n=24)	HIV+Coc (n=11)	P-values (F or t-values and % change)
				Trend test df= (2, 46)	SN vs. HIV df = 36	SN vs. HIV+Coc df = 23	HIV vs. HIV+Coc df = 33
Simple reaction	293±31	325±86	350±79	0.03* (F=1.9)	ns	0.01 (t=2.5; 19.5%)	ns
Choice reaction("7") Single digit recognition	388±30	408±47	417±55	0.04* (F=1.4)	ns	ns	ns
1-back cued response (“X” only after “A”)	388±55	461±122	452±113	ns	0.02 (t=2.1; 18.8%)	0.04 (t=1.9; 16.5%)	ns
Sequential # (1-back)	503±119	614±125	606±99	ns	0.006 (t=2.7; 22.3%)	0.02 (t=2.3; 20.5%)	ns
Sequential # (1-increment)	531±105	638±112	651±118	0.002* (F=4.9)	0.003 (t=2.9; 20.2%)	0.008 (t=2.6; 22.6%)	ns
Sequential # (2-back)	670±156	843±175	817±165	ns	0.002 (t=3.0; 25.9%)	0.02 (t=2.2; 21.8%)	ns
Degraded words with distracters	517±60	596±133	537±73	ns	0.02 (t=2.1; 15.1%)	ns	ns
Response reversal / visual scanning	640±140	703±124	733±114	0.03* (F=1.8)	ns	0.05 (t=1.7; 14.5%)	ns
Form discrimination	675±111	854±159	774±127	ns	0.0004 (t=3.7; 26.5%)	0.03 (t=2.0; 14.7%)	ns

P values for the trend tests are predictions for the values to be SN > HIV > HIV+Coc (asterisks indicate significance after correction for multiple comparisons)

P values for the post hoc unpaired t-tests predicts SN>HIV, SN>HIV+Coc or HIV>HIV+Coc.

Percentages are calculated as the corresponding deviations from SN controls