Table 1.
Sample characteristics.
| Characteristic | Schizophrenia | Healthy controls | Test statistic |
|---|---|---|---|
| Sample size | 26 | 24 | |
| Male sex, N (%) | 18 (69%) | 16 (67%) | χ2 = 0.01; df = 1; p = 0.99 |
| White ethnicity, N (%) | 11 (42%) | 15 (62%) | χ2 = 1.3; df = 1; p = 0.25 |
| Age, years, mean (SD) | 39.9 (10.4) | 36.9 (11.4) | t = 0.97, df = 47, p = 0.34 |
| Number of cigarettes smoked per day, median (min; max; IQR) | 5 (0; 35; 18) | 0 (0; 10; 0.25) | KW χ2 = 9.1; df = 1; p = 0.003 |
| Smokers, N (%) | 15 (57.7%) | 6 (25%) | χ2 = 4.2; df = 1; p = 0.04 |
| Activity score, median (IQR) | 2 (0) | 3 (1) | KW χ2 = 43.8; df = 1; p = 0.05 |
| BSA (m2), mean (SD) | 2.02 (0.30) | 1.95 (0.23) | t = 0.9, df = 47, p = 0.40 |
| Body mass index (BMI) (kg/m2), mean (SD) | 28.77 (7.19) | 25.96 (5.19) | t = 1.6, df = 45, p = 0.12 |
| Systolic BP (mmHg), mean (SD) | 123 (11) | 122 (13) | t = 0.34, df = 47, p = 0.73 |
| Diastolic BP (mmHg), mean (SD) | 80 (9) | 77 (8) | t = 1.1, df = 47, p = 0.28 |
| Chlorpromazine equivalent dose (mg/day), median (IQR) | 358.98 (221) | N/A | N/A |
| Duration of treatment (years), median (IQR) | 12 (15) | N/A | N/A |
| Total PANSS score, median (IQR) | 55 (29) | N/A | N/A |
df degrees of freedom, p p value, KW χ2 Kruskal–Wallis chi squared, t t test statistic, SD standard deviation, IQR inter-quartile range, N/A not available, BSA body surface area (calculated using Mosteller formula), BP blood pressure.