Table 1.
Descriptive statistics for the control and PND groups. (p-values are from two-sided independent group t-tests and Χ2-tests.)
| control (n=35) | PND (n=47) | p | |
|---|---|---|---|
| mean age in months (s.d.) | 60.5 (1.0) | 60.3 (0.9) | 0.34 |
| proportion of males | 49% | 47% | 0.87 |
| proportion of social classes I, II or III non-manual | 69% | 64% | 65 |
| proportion of insecure attachment at 18 months | 26% | 64% | 0.001 |
| proportion of maternal depression at 18 months–5 years | 17% | 51% | 0.002 |
| proportion of child involvement in marital discord | 14% | 40% | 0.01 |
| proportion who did not pass the false belief task | 12% | 20% | 0.36 |
| mean (s.d.) McCarthy General Cognitive Index | 111.1 (10.3) | 111.2 (12.8) | 0.96 |
| mean (s.d.) McCarthy Verbal Subscale | 57.1 (10.3) | 58.3 (10.6) | 0.61 |
| mean (s.d.) maternal child focused speech | 1.21 (1.1) | 1.14 (0.9) | 0.75 |
| mean (s.d.) intentionality: bedtime | 7.40 (2.28) | 7.28 (2.95) | 0.86 |
| mean (s.d.) intentionality: bad and nasty time | 6.06 (3.65) | 6.02 (3.41) | 0.96 |
| mean (s.d.) intentionality: happy and best time | 4.91 (3.38) | 5.06 (3.27) | 0.84 |