Table 1. Sociodemographic Characteristics of the E-Risk Longitudinal Twin Study Participants at 18 Years of Age.
| Variable | No. (%) of Participants | χ2 Testa | P Value | ||
|---|---|---|---|---|---|
| All | Adolescent Psychotic Experiences | No Adolescent Psychotic Experiences | |||
| Total | 2063 (100) | 623 (30.2) | 1440 (69.8) | NA | NA |
| Sex | |||||
| Male | 980 (47.5) | 305 (31.1) | 675 (68.9) | 0.8 | .39 |
| Female | 1083 (52.5) | 318 (29.4) | 765 (70.6) | ||
| Zygosity | |||||
| MZ | 1164 (56.4) | 346 (29.7) | 818 (70.3) | 0.3 | .59 |
| DZ | 899 (43.6) | 277 (30.8) | 622 (69.2) | ||
| Family SES | |||||
| Low | 691 (33.5) | 255 (36.9) | 436 (63.1) | 32.1 | <.001 |
| Middle | 683 (33.1) | 210 (30.7) | 473 (69.3) | ||
| High | 689 (33.4) | 158 (22.9) | 531 (77.1) | ||
| Neighborhood SES | |||||
| Hard pressed | 468 (25.8) | 160 (34.2) | 308 (65.8) | 24.5 | <.001 |
| Moderate means | 239 (13.2) | 83 (34.7) | 156 (65.3) | ||
| Comfortably off | 484 (26.7) | 146 (30.2) | 338 (69.8) | ||
| Urban prosperity | 131 (7.2) | 42 (32.1) | 89 (67.9) | ||
| Wealthy achievers | 489 (27.0) | 104 (21.3) | 385 (78.7) | ||
| Urbanicity | |||||
| Rural | 366 (19.7) | 82 (22.4) | 284 (77.6) | 15.9 | <.001 |
| Intermediate | 897 (48.4) | 262 (29.2) | 635 (70.8) | ||
| Urban | 592 (31.9) | 204 (34.5) | 388 (65.5) | ||
Abbreviations: E-Risk, Environmental Risk; SES, socioeconomic status.
a
Calculated as test of differences in distribution of psychotic experiences by sociodemographic variables.