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Table 2 Summary of results and main effects

From: Personality trait associations with quality-of-life outcomes following bariatric surgery: a systematic review

Author

Trait measurement tool

QoL

measurement tool

Analysis performed

Control variables

Main effects

Caltabiano [8]

International Personality Item Pool

(IPIP)

Obesity-Related Well-being scale (ORWELL 97)

Pearson correlation

Hierarchical regression

-

BMI

Associations between personality traits and Orwell 97 domains:

Extraversion and total Orwell 97: (r = -.19, p < .05)

Conscientiousness and total Orwell 97: (r = -.21, p < .05)

Emotional stability and total Orwell 97: (r =—.47, p < .01)

All other traits, not significant

Personality trait impact upon total Orwell 97:

Agreeableness and Total Orwell 97: (β = 0 .27, p < .01)

Emotional stability and Total Orwell 97: (β =—.43, p = .001)

All other traits, not significant

Personality trait impact upon Orwell 97 symptom occurrence

Agreeableness and Orwell 97 symptom occurrence: (β = .29, p < .01)

Emotional stability and Orwell 97 symptom occurrence: (β—.47, p = .001)

All other traits not significant

Personality trait impact upon Orwell 97 symptom relevance

Agreeableness and Orwell 97 symptom relevance: (β = .25, p < .05)

Emotional stability and Orwell 97 symptom relevance: (β = -.36, p = .001)

All other personality traits not significant

Pereira et al., [58]

Barratt Impulsivity Scale (BIS)

Short Form Health Survey–SF 36

Pearson correlation

Hierarchical regression

Moderation analysis

-

Professional status

Negative association between impulsivity and mental QoL: (r = -.62, p < .001)

Negative association between impulsivity and physical QoL: (r =—42, p < .001)

Impulsiveness negatively related to mental QoL: (β = -.33, t = -3.88, p < .001)

Negative impact of impulsivity upon mental QoL and physical QoL is significantly moderated by post-surgery spirituality:

(t =  − 2.57, p = .01)

(t =  − 2.04, p = .04)

Canetti et al., [11]

NEO- Personality Inventory Revised (neuroticism scale)

NEO-PI-N)

Medical Outcome Survey Short Form – 36 (MOS SF-36)

Corelation analysis

Correlation analysis:

Initial level of the outcome variables: weight loss, HRQol, mental health, psychological distress and wellbeing

Partial correlation coefficients

Neuroticism and QoL: (r = -0.03, p > .05 (no significant association detected)

Lee et al., [41]

Chinese Personality Assessment Inventory (CPAI)

Gastrointestinal Quality-of-Life Index

Students t-test / Wilcoxon test

-

Effect sizes and specific significance values were not reported

Agreeableness significantly negatively associated with in ‘gastrointestinal’ domain of QoL: (p ≤ .05)

Agreeableness significantly associated with ‘emotional’ QoL: (p ≤ .05)

Extraversion significantly positively associated with social functioning of QoL: p ≤ .05

Extraversion significantly positively impacted total change in GIQoL: (p ≤ .05)

No relationship detected for other personality traits (competence and open-mindedness) and QoL domains (GI, social, psychological, physical, total)

van Hout, et al., [69]

Amsterdam Biographical Questionnaire

(ABQ)

Rand-36 Short Form Health Survey (Rand SF-36)

Hierarchical regression

Age, gender, preoperative BMI

Neurotic lability somatic symptoms

No significant relationship, not described in reported model