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Table 1 Standardised instruments and their psychometric properties

From: Innovative psycho-educational program to prevent common postpartum mental disorders in primiparous women: a before and after controlled study

Variable Instrument Scale description Psychometric properties
Primary outcome
Common mental disorders Composite International Diagnostic Interview (CIDI) [58] 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) [70].
Baseline factors
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 [71]; correlation with self-esteem 0.58 [72].
Depressive symptoms Edinburgh Postnatal Depression Scale (EPDS) [8] 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[8].
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 [73].
Duration and frequency of infant crying and fussing in a 24 hour period Barr Chart [74]
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 [74].