Table 1.
Study Sample Characteristics
| Participants |
NMI |
NMI-ST |
OPDs |
SPD |
Statistic | ||||||
| n | 218 |
79 |
24 |
62 |
53 |
||||||
| Male/Female | % Male | Male/Female | % Male | Male/Female | % Male | Male/Female | % Male | Male/Female | % Male | ||
| Gender | 108/110 | 49.5 | 43/36 | 54.4 | 14/10 | 58.3 | 27/35 | 43.5 | 24/29 | 45.3 | χ2 = 2.77 (P= .428) |
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | ||
| Age, y | 40.2 | 16.9 | 47.0 | 18.1 | 39.0 | 15.6 | 35.9 | 14.5 | 35.5 | 15.2 | FWelch = 6.94 (P= .0003)a |
| Duration of illness, y | — | — | — | — | — | — | 21.1 | 14.6 | 20.7 | 15.2 | T test = 0.17 (P = .863) |
| Age of onset, y | — | — | — | — | — | — | 14.8 | 1.3 | 14.8 | 3.6 | T test = 0.13 (P = .894) |
| Self-disorders | 2.1 | 3.7 | 0.3 | 0.8 | 0.9 | 1.5 | 2.2 | 3.2 | 5.2 | 5.3 | FWelch = 21.70 (P < .0001)a |
| Negative symptoms | 4.1 | 5.4 | 0.9 | 2.1 | 2.5 | 4.2 | 5.1 | 5.6 | 8.4 | 5.7 | FWelch = 36.00 (P < .0001)a |
| Formal thought disorder | 3.3 | 4.7 | 0.9 | 1.9 | 1.5 | 2.2 | 4.8 | 5.6 | 6.0 | 5.3 | FWelch = 22.08 (P < .0001)a |
Note: NMI, no mental illness; NMI-ST, no mental illness with schizotypal traits; OPDs, other personality disorders; SPD, schizotypal personality disorder.
a
Bonferroni bounds–adjusted paired multiple comparisons: age (NMI > OPDs, SPD); self-disorders (NMI < OPDs, SPD; NMI-ST < SPD; OPDs < SPD); negative symptoms (NMI < OPD, SPD; NMI-ST < SPD; OPD < SPD); formal thought disorder (NMI, NMI-ST < OPD, SPD).