Table 3. Summary of SINS results.
| Measure | Correlation with Single-Item Narcissism Scale (current research) | Correlation with 4-item narcissism scale (prior research) [42] |
| General properties | ||
| Other narcissism measures | Study 1, NPI-40: r = .40*** | NPI-40: r = .46** |
| Study 2, NPI-16: r = .45*** | ||
| Study 7, NPI-16: r = .50** | ||
| Study 8, NPI-16: r = .48*** | ||
| Study 10, NPI-40: r = .29*** | ||
| Study 10, HSNS: r = .44*** | ||
| Study 10, PNI: r = .41*** | ||
| Study 10, FFNI: r = 43*** | ||
| Study 11, NPI-40: r = .28*** | ||
| Test-retest reliability | Study 3: r = .79*** (11 days) | r = .87*** (3 weeks) |
| Study 9: r = .78*** (12 days) | ||
| Discriminant validity: Right Wing Authoritarianism | Study 1: r = .11 | — |
| Demographic variables | ||
| Gender | Study 1–4, 6: Males = females | Males > females |
| Study 7, 9, 10: Males > females | ||
| Study 5: Gender not reported | ||
| Study 8: 100% female sample | ||
| Age | Study 1, 3, 4, 5, 7, 8: Not applicable – college student samples | — |
| Study 2: r = −.17∼ | ||
| Study 6: r = −.09 | ||
| Study 9: r = −.19*** | ||
| Study 10: r = −.24*** | ||
| Study 11: r = .12∼ | ||
| Intrapersonal outcomes | ||
| Social desirability | Study 1: r = −.23* | — |
| Study 7: r = −.26 | ||
| Individualism | Study 1, Triandis: r = .26** | — |
| (independent self-construal) | Study 2, Singelis: r = .20* | |
| Collectivism | Study 1, Triandis: r = −.22* | — |
| (interdependent self-construal) | Study 2, Singelis: r = .03 | |
| Positive affect | Study 1: r = .24* | — |
| Negative affect | Study 1: r = .34* | — |
| Self-esteem | Study 4, Rosenberg SE: r = .08 | Rosenberg SE: r = −.13* |
| Study 5, Rosenberg SE: r = .21* | Single-Item SE: r = −.03 | |
| Study 7, Rosenberg: r = .00 | ||
| Study 8, Rosenberg: r = .05 | ||
| Study 10, Rosenberg: r = −.20** | ||
| Depressive symptoms | Study 4: r = −.16∼ | — |
| Openness | Study 4: r = .02 | r = .15* |
| Conscientiousness | Study 4: r = −.08 | r = −.17** |
| Extraversion | Study 4: r = .20* | r = .15* |
| Agreeableness | Study 4: r = −.29** | r = −.17** |
| Neuroticism | Study 4: r = −.02 | r = −.10 |
| Risk taking | Study 6: r = .19** | — |
| Reward preferences | Study 9, non-social rewards: r = .20*** | — |
| Study 9, social rewards: r = −.26*** | ||
| Interpersonal outcomes | ||
| Aggressive behavior | Study 5: SINS associated with more aggressive behavior, after a delay | Self-reported aggressive traits |
| (i.e. Block 2 but not Block 1 of aggression trials). | Physical aggressiveness: r = .13 | |
| Hostility: r = .44** | ||
| Anger: r = .12 | ||
| Verbal aggressiveness: r = .06 | ||
| Sexual behavior | Study 6: | Short-term mating orientation: r = .34** |
| Sexual sensation seeking: r = .16** | Long-term mating orientation: r = .06 | |
| Number of partners in past year: r = .16** | Sexual experience: r = .22** | |
| SINS more willing to have sex with stranger * | Sociosexual orientation: r = .21** | |
| SINS more one night stands * | ||
| SINS less committed relationships ** | ||
| Salary entitlement | Study 7: r = .54** | — |
| Empathy | Study 8, IRI Empathic Concern: r = −.26** | — |
| Study 8, IRI Perspective Taking: r = −.19* | ||
| Study 8, IRI Personal Distress: r = .14∼ | ||
| Study 8: IRI Fantasy: r = −.06 | ||
| Study 10, IRI Empathic Concern: r = −.46*** | ||
| Study 10, IRI Perspective Taking: r = −.26*** | ||
| Prosocial behavior | Study 11: SINS associated with less prosocial behavior after an ego threat | — |
Note: ∼p<.11, *p<.05, **p<.01, ***p<.001.