Table 1 PCERA maternal, infant and dyadic subscales utilised, with Cronbach’s alpha for both samples
Subscale | Variables included in subscales | Cronbach’s alpha BD sample vs. Non-clinical sample | |
|---|---|---|---|
S1-Maternal positive affective involvement, sensitivity and responsiveness | 2)a Expressive, non-flat tone of voice 3) Warm, kind tone of voice 4) Expressed positive affect 7) Lack of depression, withdrawn mood 9) Enthusiastic mood 12) Enjoyment, pleasure 13) Positive physical contact 15) Visual contact 16) Amount of verbalisation 17) Quality of verbalisation 18) Social initiative 19) Contingent responsivity 22) Sensitivity, reads cues and responds 23) Connectedness 24) Mirroring 26) Creativity | 0.92 | 0.96 |
S2-Maternal negative affect and behaviour | 1) Angry, hostile tone of voice 3) Warm, kind tone of voice 5) Expressed negative affect 6) Angry, hostile mood 11) Displeasure 14) Negative physical contact 16) Amount of verbalisation 19) Contingent responsivity 21) Lack of structuring and mediating 22) Lack of sensitivity and responsivity 25) Rigidity 27) Intrusiveness 28) Inconsistency/unpredictability | 0.88 | 0.93 |
S3-Infant positive affect, communicative and social skills | 30) Expressed positive affect 32) Happy, pleasant 33) Apathetic, withdrawn 38) Alertness 39) Social initiative 40) Social responsiveness 47) Robustness 55) Visual contact 56) Communicative competence 57) Readability | 0.96 | 0.94 |
S4-Infant dysregulation and irritability | 31) Expressed negative affect 34) Anxiety 35) Irritable, angry 37) Emotional lability 41) Avoiding/averting 46) Attentional abilities 50) Self-regulation, organisation | 0.80 | 0.87 |
S5-Dyadic mutuality and reciprocity | 59) No flat, empty, constricted 61) Enthusiasm, joie de vivre 63) Reciprocity | 0.96 | 0.88 |
S6-Dyadic tension | 58) Anger, hostility 60) Tension, anxiety 62) No joint attention, activity 64) Disorganisation 65) State dissimilarity | 0.86 | 0.90 |