Table 1 Mean scores, standard deviations and bivariate correlations between the aforementioned variables
| Â | M (SD) | Age+ | 2 | 2a | 2b | 3 | 3a | 3b |
|---|---|---|---|---|---|---|---|---|
1. PSNSU (Overall score) | 2.50 (0.80) | − .237** | .343** | .351** | .287** | .294** | .333** | .163** |
 1a PSNSU sub-factor 1 | 2.57 (0.87) | − .195** | .298** | .310** | .244** | .246** | .288** | .123** |
 1b PSNSU sub-factor 2 | 2.42 (0.87) | − .240** | .333** | .336** | .285** | .296** | .326** | .177** |
2. Machiavellianism (Overall score) | 3.39 (0.72) | − .275** |  | .949** | .927** | .545** | .583** | .352** |
 2a Machiavellianism sub-factor 1 | 3.39 (0.75) | − .261** |  |  | .760** | .538** | .585** | .334** |
 2b Machiavellianism sub-factor 2 | 3.38 (0.78) | − .255** |  |  |  | .479** | .501** | .325** |
3. Narcissism (Overall score) | 2.98 (0.62) | − .245** |  |  |  |  | .933** | .847** |
 3a Narcissism sub-factor 1 | 3.11 (0.74) | − .237** |  |  |  |  |  | .599** |
 3b Narcissism sub-factor 2 | 2.82 (0.63) | − .196** |  |  |  |  |  |  |
4. Psychopathy (Overall score) | 2.65 (0.83) | − .350** |  |  |  |  |  |  |
 4a Psychopathy sub-factor 1 | 2.68 (0.89) | − .351** |  |  |  |  |  |  |
 4b Psychopathy sub-factor 2 | 2.61 (0.87) | − .306** |  |  |  |  |  |  |
5. Emotion dysregulation (Overall score) | 2.22 (0.78) | − .288** |  |  |  |  |  |  |
 5a Lack of emotional clarity | 2.01 (0.92) | − .240** |  |  |  |  |  |  |
 5b Difficulties engaging in goal-directed behaviour | 2.45 (0.95) | − .215** |  |  |  |  |  |  |
 5c Impulse control difficulties | 2.04 (0.94) | − .251** |  |  |  |  |  |  |
 5d Non-acceptance of emotional responses | 2.29 (0.96) | − .221** |  |  |  |  |  |  |
 5e Limited access to effective emotion regulation strategies | 2.23 (0.88) | − .271** |  |  |  |  |  |  |
| Â | 4 | 4a | 4b | 5 | 5a | 5b | 5c | 5d | 5e |
|---|---|---|---|---|---|---|---|---|---|
1. PSNSU (Overall score) | .347** | .337** | .317** | .423** | .399** | .339** | .427** | .281** | .356** |
 1a PSNSU sub-factor 1 | .241** | .235** | .219** | .382** | .325** | .329** | .374** | .261** | .325** |
 1b PSNSU sub-factor 2 | .397** | .384** | .364** | .396** | .409** | .293** | .412** | .256** | .329** |
2. Machiavellianism (Overall score) | .655** | .637** | .597** | .342** | .322** | .209** | .393** | .263** | .277** |
 2a Machiavellianism sub-factor 1 | .599** | .578** | .552** | .317** | .298** | .195** | .361** | .256** | .250** |
 2b Machiavellianism sub-factor 2 | .633** | .622** | .569** | .326** | .307** | .197** | .377** | .237** | .272** |
3. Narcissism (Overall score) | .521** | .491** | .495** | .122** | .169** | − .008 | .278** | .083 | .049 |
 3a Narcissism sub-factor 1 | .554** | .527** | .522** | .149** | .201** | .001 | .296** | .110** | .075 |
 3b Narcissism sub-factor 2 | .340** | .315** | .330** | .052 | .079 | − .018 | .182** | .022 | − .003 |
4. Psychopathy (Overall score) | Â | .958** | .930** | .428** | .399** | .223** | .548** | .288** | .363** |
 4a Psychopathy sub-factor 1 |  |  | .787** | .429** | .393** | .233** | .549** | .276** | .367** |
 4b Psychopathy sub-factor 2 |  |  |  | .375** | .357** | − 183** | .479** | .268** | .313** |
5. Emotion dysregulation (Overall score) | Â | Â | Â | Â | .719** | .832** | .817** | .831** | .929** |
 5a Lack of emotional clarity |  |  |  |  |  | .530** | .576** | .482** | .594** |
 5b Difficulties engaging in goal-directed behaviour |  |  |  |  |  |  | .567** | .609** | .730** |
 5c Impulse control difficulties |  |  |  |  |  |  |  | .589** | .683** |
 5d Non-acceptance of emotional responses |  |  |  |  |  |  |  |  | .727** |
 5e Limited access to effective emotion regulation strategies |  |  |  |  |  |  |  |  |  |