Table 1.
| People with Schizophrenia (mean ± stdev) | Healthy Control Subjects (mean ± stdev) | Statistic | P-value | |
|---|---|---|---|---|
| Age | 43.1 ± 10.5 (range 22-53) | 40.2 ±11.1 (range 25-52) | t(32)=.76 | P>0.4 |
| Male: Female | 14 : 3 | 14 : 3 | χ2 =0 | P=1 |
| African American : Caucasian | 5 : 12 | 8 : 9 | χ2 =1.12 | P=0.29 |
| Education (years) | 12.1 ± 2.1 | 12.5 ± 1.2 | t(32)=.70 | P>0.4 |
| Number of cigarettes/day | 17.9 ± 8.4 | 16.6 ± 9.7 | t(32)=.41 | P>0.6 |
| Years of Smoking | 21.9 ± 11.3 | 21.8 ± 11.4 | t(32)=.05 | P>0.9 |
| Number of quit attempts | 3.7 ± 3.4 | 3.8 ± 7.6 | t(32)=.06 | P>0.9 |
| Age start smoking | 17.8 ± 4.8 | 15.4 ± 3.4 | t(32)=1.64 | P=0.11 |
| Age smoking regularly | 19.5 ± 4.3 | 18.8 ± 5.7 | t(32)=.41 | P>0.6 |
| FTNDa total score | 4.6 ± 2.1 | 5.6 ± 1.8 | t(32)=1.43 | P=0.16 |
| Arrival CO (ppm)b | 29.5 ± 19.8 | 20.6 ± 6.8 | t(32)=1.76 | P=0.09 |
| Estimated IQc | 97.9 ± 12.2 | 111.1 ± 14.0 | t(32)=2.93 | P<0.01 |
| Brief Psychiatric Rating Scale | 36.6 ± 8.0 (range 24-52) | |||
| Scale for the Assessment of Negative Symptoms | 37.9 ± 13.7 (range 15-64) |
a
Fagerstrom Test for Nicotine Dependence
b
Average over all three test sessions
c
estimated by the vocabulary and matrix reasoning subscales of the Wechsler Abbreviated Scale of Intelligence(47)