Table 1. Demographic data between controls and patients with schizophrenia.
| Variable | Control (n = 74) | Schizophrenia (n = 106) | Test statisticsa | P-valueb |
| Gender, n (%) | 0.90 | 0.343 | ||
| Male | 31 (41.9) | 52(49.1) | ||
| Female | 43 (58.1) | 54(50.9) | ||
| Age – years, mean(SD) | 36.2 (11.5) | 37.2 (10.0) | 0.62 | 0.539 |
| Education – years, mean(SD) | 15.3 (3.6) | 13.8 (2.7) | 5.07 | <0.001 |
| Smoking Status | ||||
| Smoker, n (%) | 5 (6.8) | 18 (17.0) | 4.09 | 0.043 |
| Amount – PPD, mean(SD) | 0.05(0.21) | 0.16(0.40) | 2.46 | 0.015 |
SD: standard deviation; PPD: packs per day.
a
Independent t test for age, years of education and amount of smoking; Chi-square test for gender and smoker.
b
P-values were 2-sided.