Table 2 Interaction score comparisons (mean) between the BD and the non-clinical sample on PCERA subscales at 12 months

S1

 Maternal positive affective involvement and verbalisation^a

3.4 (0.57)

3.1–3.6

4.1 (0.51)

3.9–4.3

− 0.74 (− 1.03 to − 0.44)

< 0.001^*

1.36

S2

 Maternal negative affect and behaviour^a

4.4 (0.54)

4.2–4.6

4.9 (0.22)

4.8–5.0

− 0.49 (− 0.71 to − 0.27)

< 0.001^*

1.19

S3

 Maternal intrusiveness, insensitivity and inconsistency^a

3.8 (0.49)

3.6–4.0

4.5 (0.37)

4.4–4.6

− 0.68 (− 0.92 to − 0.45)

< 0.001^*

1.57

S4

 Infant positive affect, communicative and social skills^a

3.3 (0.68)

3.0–3.6

3.9 (0.61)

3.7–4.2

− 0.63 (− 0.98 to − 0.28)

0.001^*

0.97

S5

 Infant quality of play, interest and attentional skills^a

4.0 (0.40)

3.8–4.1

4.4 (0.37)

4.3–4.6

− 0.43 (− 0.64 to − 0.22)

< 0.001^*

1.12

S6

 Infant dysregulation and irritability^b

4.7 (4.5, 4.8)

4.6–4.8

4.9 (4.7, 5.0)

4.6–4.9

*

0.04^*

0.28^c

S7

 Dyadic mutuality and reciprocity^a

2.7 (0.74)

2.4–3.0

3.7 (0.76)

3.4–4.0

− 1.03 (− 1.44 to − 0.63)

< 0.001^*

1.38

S8

 Dyadic disorganisation and tension^a

3.6 (0.57)

3.4–3.9

4.5 (0.41)

4.4–4.7

− 0.88 (− 1.14 to − 0.61)

< 0.001^*

1.78