|Variable||Instrument||Scale description||Psychometric properties|
|Common mental disorders||Composite International Diagnostic Interview (CIDI) ||Widely used, completely structured lay-administered clinical interview that yields DSM-IV and ICD-10 diagnoses through algorithms.||
Concordance between CIDI diagnoses and Structured Clinical Interview for DSM-IV (SCID)|
diagnoses of depression (κ = 0.54) and anxiety disorders (κ = 0.48) .
|Personality factors which might increase vulnerability to mental health problems||Vulnerable Personality Style Questionnaire (VPSQ)||
Vulnerability Subscale measures over-sensitivity to the opinions of others and lack of assertiveness|
Range of scores 6 to 30
|Cronbach's α for internal consistency 0.77; test - retest reliability 0.82 p < 0.01, in a model predicting postnatal depression sensitivity 0.14 and specificity 0.94 ; correlation with self-esteem 0.58 .|
|Depressive symptoms||Edinburgh Postnatal Depression Scale (EPDS) ||
10-item self- report scale to screen for probable depression during the postnatal year in research and health care settings.|
Range of scores 0 to 30
|Standardised α 0.87; sensitivity 0.85 and specificity 0.77; positive predictive value 0.83.|
|Quality of relationship with intimate partner||
Intimate Bonds Measure (IBM)|
Subscales: Care, Control
Care subscale assesses sensitivity, warmth, emotional responsiveness, trust, physical gentleness and kindness.|
Control subscale assesses coercion, dominance, exertion of power and extent of criticism.
Range of scores 0 to 36 for each subscale
Care: Cronbach's α 0.94; correlation with clinical interview ratings of quality of relationship 0.68.|
Control: Cronbach's α 0.89 and correlation with clinical interview ratings of quality of relationship 0.74 .
|Duration and frequency of infant crying and fussing in a 24 hour period||
Barr Chart |
Possible range 0 to 24 hours
|Parental diary of duration of episodes of crying, fussing, sleeping, and content infant behaviours.||Reliably completed by parents, high correlation with tape recordings: for frequency (r = 0.85, p = 0.002) and duration (r = 0.90, p = 0.001) of episodes .|