Table 1.
Means, Standard Deviations and Analysis of Variance by Sex and Zygosity for Psychotic Experiences and Bullying Victimization
| Total | Male | Female | MZ | DZ | Score | Skew | Kurtosis | Cronbach α | ANOVA | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | Range | Sex | Zyg | Sex*Zyg | R 2 | N | ||||
| Psychotic experiences | ||||||||||||||
| Paranoia | 12.17 (10.62) | 11.75 (10.42) | 12.50 (10.77) | 11.79 (10.46) | 12.37 (10.70) | 0–71 | 0.17 | 3.07 | .93 | <0.01 | 0.01 | 0.45 | .00 | 4.776 |
| Hallucinations | 4.65 (6.00) | 4.30 (5.77) | 4.94 (6.16) | 4.47 (5.91) | 4.76 (6.05) | 0–45 | 0.55 | 2.74 | .87 | <0.01 | 0.01 | 0.53 | .01 | 4.784 |
| Cognitive Disorganization | 3.96 (2.85) | 3.40 (2.72) | 4.41 (2.87) | 3.86 (2.82) | 4.01 (2.86) | 0–11 | 0.44 | 2.31 | .73 | <0.01 | 0.01 | 0.66 | .03 | 4.777 |
| Grandiosity | 5.32 (4.42) | 5.82 (4.56) | 4.91 (4.27) | 5.26 (4.35) | 5.35 (4.46) | 0–24 | −0.08 | 2.79 | .85 | <0.01 | 0.56 | 0.96 | .01 | 4.780 |
| Anhedonia | 17.33 (7.93) | 19.50 (7.98) | 15.58 (7.44) | 17.07 (7.96) | 17.48 (7.91) | 0–50 | −0.48 | 3.10 | .78 | <0.01 | 0.44 | 0.85 | .06 | 4.780 |
| Parent-rated Negative Symptoms | 2.81 (3.89) | 3.17 (4.10) | 2.52 (3.69) | 2.64 (3.57) | 2.91 (4.06) | 0–30 | 0.56 | 2.72 | .85 | <0.01 | 0.03 | 0.02 | .01 | 4.792 |
| Bullying victimization | 7.55 (7.24) | 8.40 (7.63) | 6.82 (6.79) | 7.61 (7.37) | 7.45 (7.11) | 0–32 | 0.03 | 2.23 | .91 | <0.01 | 0.54 | 0.22 | .01 | 3.884 |
Note: Means and SD reported prior to transformation. DZ = dizygotic twins; MZ = monozygotic; SD = standard deviation. Skew and kurtosis reported after transformation for normality. Analyses of variances were performed using 1 random member of each twin pair. Sex = P value associated with the effect of sex on the means; Zyg. = P value associated with the effect of zygosity on the means; Sex*Zyg = P value associated with the effects of the interaction between sex and zygosity on the means; R 2 = proportion of the total variance explained by sex and zygosity; N = number of randomly selected individuals from each twin pair.