Table 2 Means and standard deviations for parenting stress across time and groups
| Â | T1 | T2 | T3 | T4 |
|---|---|---|---|---|
Variable | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) |
Total stress | Â | Â | Â | Â |
 OBD | 50.35 (18.71) | 42.04 (24.61) | 29.68 (13.75) | 37.65 (23.54) |
 Control offspring | 26.28 (10.94) | 32.33 (18.79) | 29.10 (16.23) | 34.52 (23.01) |
Parental distress | Â | Â | Â | Â |
 OBD | 18.71 (7.18) | 16.08 (9.89) | 14.16 (8.89) | 4.65 (6.77) |
 Control offspring | 8.41 (5.12) | 11.07 (8.69) | 12.73 (10.80) | 4.72 (9.33) |
Interaction | Â | Â | Â | Â |
 OBD | 12.09 (8.88) | 9.60 (8.83) | 9.20 (8.33) | 8.40 (8.92) |
 Control offspring | 4.78 (4.76) | 7.03 (7.04) | 8.57 (7.88) | 7.72 (8.39) |
Difficult child | Â | Â | Â | Â |
 OBD | 19.56 (6.25) | 16.36 (7.81) | 15.52 (6.46) | 16.40 (7.82) |
 Control offspring | 13.09 (3.84) | 14.23 (5.37) | 16.37 (6.42) | 15.59 (6.21) |