Table 1.
Sociodemographic Characteristics of the Samples With and Without Follow-up Information Available
| Characteristic | Followed Up (n=291) | Not Followed Up (n=79) | Statistic | df | P Value |
|---|---|---|---|---|---|
| Age, mean±SD, y | 18.1±4.6 | 18.6±5.3 | t=−0.8 | 368 | .41 |
| Parental education, mean±SD, y | 5.4±1.8 | 4.9±1.9 | t=1.7 | 295 | .09 |
| No. of SIPS symptoms, mean±SD | |||||
| Positive | 12.0±4.1 | 11.6±3.6 | t=0.8 | 368 | .42 |
| Negative | 12.1±6.8 | 11.8±7.1 | t=0.3 | 362 | .73 |
| Social functioning, mean±SD score38 | 6.1±1.5 | 6.3±1.5 | t=;0.7 | 367 | .48 |
| Role functioning, mean±SD, score38 | 6.1±1.7 | 5.9±1.6 | t=0.9 | 368 | .33 |
| Global functioning, mean±SD, score44 | 46.5±11.9 | 45.9±12.6 | t=0.4 | 355 | .69 |
| Female, No. (%) | 121 (41.6) | 20 (25.3) | χ2=6.9 | 1 | .01 |
| Nonwhite race, No. (%) | 56 (19.6) | 16 (22.5) | χ2=3.3 | 1 | .51 |
| Hispanic ethnicity, No. (%) | 39 (13.9) | 17 (22.7) | χ2=3.4 | 1 | .07 |
| Entry year, No. (%) | χ2=8.2 | 7 | .32 | ||
| 1998 | 16 (5.5) | 2 (2.5) | |||
| 1999 | 21 (7.2) | 5 (6.3) | |||
| 2000 | 40 (13.8) | 7 (8.9) | |||
| 2001 | 35 (12.0) | 10 (12.7) | |||
| 2002 | 43 (14.8) | 10 (12.7) | |||
| 2003 | 51 (17.5) | 11 (13.9) | |||
| 2004 | 70 (24.1) | 25 (31.6) | |||
| 2005 | 15 (5.2) | 9 (11.4) | |||
| SIPS diagnosis, No. (%) | χ2=2.0 | 2 | .35 | ||
| GRD | 2 (0.7) | 0 | |||
| BIPS | 7 (2.4) | 4 (5.1) | |||
| APS | 282 (96.9) | 75 (94.9) | |||
| SPD diagnosis, No. (%) | 88/287 (30.7) | 24/77 (31.2) | χ2=0.0 | 1 | .94 |
| First-degree relative with psychosis, No. (%) | 69/273 (25.3) | 14/63 (22.2) | χ2=0.3 | 1 | .61 |
| First- or second-degree relative with psychosis, No. (%) | 118/277 (42.6) | 20/64 (31.2) | χ2=2.8 | 1 | .09 |
Abbreviations: APS, attenuated positive symptoms; BIPS, brief intermittent psychotic symptoms; GRD, genetic risk and deterioration; SIPS, Structured Interview for Prodromal Syndromes; SPD, schizotypal personality disorder.