Table 2.

Sensation seeking and lack of premeditation predict frequency of OTP use over time.

Predictor	Coefficient	Standard Error	IRR (95% ci)
Sex	0.67	0.12	1.95 (1.54, 2.45)
Race	−0.05	0.05	0.95 (0.86, 1.05)
Student status	0.02	0.12	1.02 (0.81, 1.28)
Days completed	0.02	0.01	1.02 (0.99, 1.05)
Cigarette days	0.05	0.01	1.05 (1.03, 1.08)
Time	−0.17	0.04	0.84 (0.78, 0.91)
Lack of perseverance	−0.02	0.03	0.98 (0.93, 1.04)
Lack of premeditation	0.07	0.03	1.07 (1.01, 1.13)
Sensation Seeking	0.04	0.02	1.04 (1.00, 1.08)
Negative urgency	−0.03	0.02	0.98 (0.93, 1.02)
Positive urgency	0.03	0.02	1.03 (0.99, 1.08)
Anhedonia	0.01	0.01	1.01 (1.00, 1.03)
Negative affectivity	−0.01	0.01	0.99 (0.97, 1.01)