Table 4.
DSM-IV NPD item-by-item tests for effects of age on item thresholds
| −2lnL | Δ χ 2 | Δ df | p | AIC | Effect on threshold | |
|---|---|---|---|---|---|---|
| Model | ||||||
| Age, sex and interaction on latent mean and variance (baseline) | 16 250.29 | 64.01 | 6 | 0.000 | −33 291.71 | |
| Item free | ||||||
| Has grandiose sense of self-importance | 16 244.32 | 5.96 | 1 | 0.015 | −33 295.67 | 0.40 |
| Is preoccupied with fantasies of unlimited success | 16 234.79 | 15.49 | 1 | 0.000 | −33 305.21 | 0.57 |
| Believes he or she is 'special' and unique | 16 250.32 | −0.03 | 1 | NA | −33 289.68 | 0.01 |
| Requires excessive admiration | 16 249.94 | 0.35 | 1 | 0.555 | −33 290.06 | −0.07 |
| Has sense of entitlement, i.e. unreasonable expectations of favorable treatment | 16 247.93 | 2.36 | 1 | 0.124 | −33 292.07 | −0.28 |
| Is interpersonally exploitative, i.e. takes advantage of others | 16 248.95 | 1.33 | 1 | 0.248 | −33 291.05 | −0.16 |
| Lacks empathy: is unwilling to recognize/identify with feelings of others | 16 249.69 | 0.59 | 1 | 0.441 | −33 290.30 | −0.11 |
| Is often envious of others or believes that others are envious of him or her | 16 248.96 | 1.33 | 1 | 0.249 | −33 291.04 | 0.15 |
| Shows arrogant, haughty behaviors or attitudes | 16 239.27 | 11.02 | 1 | 0.001 | −33 300.73 | −0.46 |
N = 2794 (1772 female, 1022 male). Females coded as one. Effect sizes in z-scores. NA, not available.