O. Lindfors

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Confounding and missing data in cost-effectiveness analysis: comparing different methods

P. Knekt, T. Härkänen, E. Virtala, 2013, Health Economics Review.

A case study in comparing therapies involving informative drop‐out, non‐ignorable non‐compliance and repeated measurements

P. Knekt, T. Härkänen, E. Virtala, 2005, Statistics in medicine.

The Helsinki Psychotherapy Study: Effectiveness, Sufficiency, and Suitability of Short- and Long-Term Psychotherapy

P. Knekt, T. Härkänen, E. Virtala, 2012 .

Effectiveness of short-term and long-term psychotherapy on work ability and functional capacity--a randomized clinical trial on depressive and anxiety disorders.

P. Knekt, M. Laaksonen, O. Lindfors, 2008, Journal of affective disorders.

Randomized trial on the effectiveness of long-and short-term psychodynamic psychotherapy and solution-focused therapy on psychiatric symptoms during a 3-year follow-up

P. Knekt, T. Härkänen, M. Marttunen, 2007, Psychological Medicine.

Childhood adversities as predictors of improvement in psychiatric symptoms and global functioning in solution-focused and short- and long-term psychodynamic psychotherapy during a 5-year follow-up.

P. Knekt, T. Härkänen, E. Virtala, 2018, Journal of affective disorders.

Patients' pre-treatment interpersonal problems as predictors of therapeutic alliance in long-term psychodynamic psychotherapy

P. Knekt, O. Lindfors, E. Heinonen, 2016, Psychiatry Research.

The effectiveness of short- and long-term psychotherapy on personality functioning during a 5-year follow-up.

P. Knekt, T. Härkänen, E. Virtala, 2015, Journal of affective disorders.

Therapists’ professional and personal characteristics as predictors of outcome in long-term psychodynamic psychotherapy and psychoanalysis

P. Knekt, O. Lindfors, T. Jääskeläinen, 2014, European Psychiatry.

Intelligence as a predictor of outcome in short- and long-term psychotherapy

P. Knekt, O. Lindfors, Taru Saari, 2014, Psychiatry Research.

Psychological Predictors on the Outcome of Short-Term Psychodynamic Psychotherapy and Solution-Focused Therapy in the Treatment of Mood and Anxiety Disorder

P. Knekt, M. Laaksonen, O. Lindfors, 2013, European Psychiatry.

Randomized trial on the effectiveness of long- and short-term psychotherapy on psychiatric symptoms and working ability during a 5-year follow-up

P. Knekt, T. Härkänen, E. Virtala, 2013, Nordic journal of psychiatry.

Prediction of the outcome of short- and long-term psychotherapy based on socio-demographic factors.

P. Knekt, M. Laaksonen, O. Lindfors, 2012, Journal of affective disorders.

What Works for Whom: Patients' Psychological Resources and Vulnerabilities as Common and Specific Predictors of Working Alliance in Different Psychotherapies

P. Knekt, O. Lindfors, E. Heinonen, 2022, Frontiers in Psychiatry.

Therapists' professional and personal characteristics as predictors of outcome in short- and long-term psychotherapy.

P. Knekt, M. Laaksonen, O. Lindfors, 2012, Journal of affective disorders.

Association between the Rorschach Ego Impairment Index and the Level of Personality Organization interview assessment in depressive and anxiety disorder patients

P. Knekt, O. Lindfors, Harri Valkonen, 2012, Psychiatry Research.

Use of auxiliary psychiatric treatment during a 5-year follow-up among patients receiving short- or long-term psychotherapy.

P. Knekt, E. Virtala, M. Laaksonen, 2011, Journal of affective disorders.

Personality functioning and psychotherapy outcome

O. Lindfors, 2014 .

Quasi-experimental study on the effectiveness of psychoanalysis, long-term and short-term psychotherapy on psychiatric symptoms, work ability and functional capacity during a 5-year follow-up.

P. Knekt, T. Härkänen, E. Virtala, 2011, Journal of affective disorders.

Effectiveness of psychoanalysis and long-term psychodynamic psychotherapy on personality and social functioning 10 years after start of treatment

P. Knekt, T. Härkänen, J. Lehtonen, 2019, Psychiatry Research.

Concordance between Composite International Diagnostic Interview and self‐reports of depressive symptoms: a re‐analysis

M. Jokela, L. Keltikangas-Järvinen, S. Pirkola, 2015, International journal of methods in psychiatric research.

Associations of early childhood adversities with mental disorders, psychological functioning, and suitability for psychotherapy in adulthood

P. Knekt, T. Härkänen, E. Virtala, 2018, Psychiatry Research.

Self-Report Dieters: Who Are They?

S. Männistö, P. Knekt, O. Lindfors, 2019, Nutrients.

The cost-effectiveness of short-term psychodynamic psychotherapy and solution-focused therapy in the treatment of depressive and anxiety disorders during a one-year follow-up.

P. Knekt, E. Virtala, M. Laaksonen, 2012, The journal of mental health policy and economics.

Suitability for Psychotherapy Scale (SPS) and its reliability, validity, and prediction.

V. Aalberg, P. Knekt, M. Laaksonen, 2012, The British journal of clinical psychology.

The cost-effectiveness of short-term and long-term psychotherapy in the treatment of depressive and anxiety disorders during a 5-year follow-up.

P. Knekt, T. Härkänen, E. Virtala, 2016, Journal of affective disorders.

The Effectiveness of Solution-Focused Therapy and Short- and Long-Term Psychodynamic Psychotherapy on Self-Concept During a 3-Year Follow-Up

P. Knekt, E. Virtala, M. Laaksonen, 2012, The Journal of nervous and mental disease.

Ego Impairment Index (EII‐2) as a predictor of outcome in short‐ and long‐term psychotherapy during a 5‐year follow‐up

P. Knekt, J. Holma, O. Lindfors, 2022, Journal of clinical psychology.

Psychoanalytic psychotherapy in Finland

O. Lindfors, M. Keinänen, 2020 .

Associations between the Rorschach Ego Impairment Index and Measures on Intrapsychic and Interpersonal Functioning

J. Wahlström, P. Knekt, O. Lindfors, 2018 .

The prediction of the level of personality organization on reduction of psychiatric symptoms and improvement of work ability in short‐ versus long‐term psychotherapies during a 5‐year follow‐up

P. Knekt, T. Härkänen, E. Virtala, 2017, Psychology and psychotherapy.

The impact of psychotherapy treatments of different length and type on health behaviour during a five-year follow-up

P. Knekt, O. Lindfors, Kaisa Jyrä, 2017, Psychotherapy research : journal of the Society for Psychotherapy Research.

Effectiveness of Psychoanalysis and Long-term Psychodynamic Psychotherapy 10 Years After Start of Treatment

P. Knekt, J. Lehtonen, E. Virtala, 2017, European Psychiatry.

The Effectiveness of Three Psychotherapies of Different type and Length in the Treatment of Patients Suffering from Anxiety Disorder

P. Knekt, T. Maljanen, O. Lindfors, 2017, European Psychiatry.

The outcome of short- and long-term psychotherapy 10 years after start of treatment

P. Knekt, T. Härkänen, J. Lehtonen, 2016, Psychological Medicine.

Randomized trial on the effectiveness of long- and short-term psychotherapy on psychosocial functioning and quality of life during a 5-year follow-up

P. Knekt, K. Härkäpää, E. Virtala, 2015, Psychiatry Research.

Self-reported immature defense style as a predictor of outcome in short-term and long-term psychotherapy

P. Knekt, M. Laaksonen, O. Lindfors, 2014, Brain and behavior.

Social support as a predictor of the outcome of depressive and anxiety disorder in short-term and long-term psychotherapy

P. Knekt, O. Lindfors, T. Jääskeläinen, 2014, Psychiatry Research.

Changes in studying abilities as perceived by students attending psychotherapy

K. Härkäpää, O. Lindfors, A. Järvikoski, 2014 .

Quality of object relations modifies the effectiveness of short- and long-term psychotherapy on self-concept

P. Knekt, E. Virtala, O. Lindfors, 2013 .

Psychological predictors of the recovery from mood or anxiety disorder in short-term and long-term psychotherapy during a 3-year follow-up

P. Knekt, M. Laaksonen, O. Lindfors, 2013, Psychiatry Research.

Concurrent Validity of the Quality of Object Relations Scale (QORS) in Relation to Proxy Assessment of the Theoretical Scale Constituents

P. Knekt, E. Virtala, O. Lindfors, 2012, Psychopathology.

Outcomes of psychotherapy from the perspective of the users

Jukka Valkonen, V. Hänninen, O. Lindfors, 2011, Psychotherapy research : journal of the Society for Psychotherapy Research.

Changes in lifestyle for psychiatric patients three years after the start of short- and long-term psychodynamic psychotherapy and solution-focused therapy

P. Knekt, M. Laaksonen, O. Lindfors, 2010, European Psychiatry.

Pretreatment clinical and psychosocial predictors of remission from depression after short-term psychodynamic psychotherapy and solution-focused therapy: a 1-year follow-up study

P. Knekt, M. Marttunen, M. Laaksonen, 2008, Psychotherapy research : journal of the Society for Psychotherapy Research.

Self-concept and quality of object relations as predictors of outcome in short- and long-term psychotherapy.

P. Knekt, E. Virtala, O. Lindfors, 2014, Journal of affective disorders.

Higher serum 25-hydroxyvitamin D concentrations are related to a reduced risk of depression.

J. Suvisaari, S. Männistö, P. Knekt, 2015, The British journal of nutrition.

Self‐report dieting and long‐term changes in body mass index and waist circumference

S. Männistö, P. Knekt, O. Lindfors, 2019, Obesity science & practice.

Follow-up of the effectiveness of long-term psychodynamic psychotherapy and psychoanalysis 5 years after the end of psychoanalysis: Minor differences in psychiatric symptoms and work ability

P. Knekt, O. Lindfors, E. Heinonen, 2018, Neurology, Psychiatry and Brain Research.

Therapists' professional and personal characteristics as predictors of working alliance in short-term and long-term psychotherapies.

P. Knekt, T. Härkänen, E. Virtala, 2013, Clinical psychology & psychotherapy.

Baseline symptom severity predicts serotonin transporter change during psychotherapy in patients with major depression

R. Vanninen, J. Tiihonen, P. Knekt, 2016, Psychiatry and clinical neurosciences.

Effects of Scheduled Waiting for Psychotherapy in Patients With Major Depression

J. Tiihonen, P. Knekt, M. Valkonen-Korhonen, 2017, The Journal of nervous and mental disease.

The Effectiveness of Three Psychotherapies of Different Type and Length in the Treatment of Patients Suffering from Anxiety Disorders

P. Knekt, T. Härkänen, E. Virtala, 2020, Systemic Research in Individual, Couple, and Family Therapy and Counseling.

Dispositional optimism as predictor of outcome in short‐ and long‐term psychotherapy

P. Knekt, K. Härkäpää, O. Lindfors, 2017, Psychology and psychotherapy.

Predicting improvement of work ability in modalities of short- and long-term psychotherapy: The differential impact of reflective ability and other aspects of patient suitability.

P. Knekt, E. Virtala, O. Lindfors, 2021, Journal of clinical psychology.

A randomized trial of the effect of four forms of psychotherapy on depressive and anxiety disorders. Design, methods, and results on the effectiveness of short-term psychodynamic psychotherapy and solution-focused therapy during a one-year follow-up

P. Knekt, O. Lindfors, Kansaneläkelaitos Kela, 2004 .

Estimating efficacy in the presence of non-ignorable non-trial interventions in the Helsinki Psychotherapy Study

E. Arjas, P. Knekt, T. Härkänen, 2016, Statistical methods in medical research.

Poor suitability for psychotherapy - a risk factor for treatment non-attendance?

P. Knekt, O. Lindfors, Leena Grandell, 2021, Journal of affective disorders.

Self-Report Dieters: Who Are They?

S. Männistö, P. Knekt, O. Lindfors, 2019, Nutrients.

The outcome of short- and long-term psychotherapy 10 years after start of treatment

P. Knekt, T. Härkänen, E. Virtala, 2016, Psychological Medicine.

The effect of individual short- and long-term psychotherapy on perceived social support: analysis of secondary outcomes of a randomized clinical trial

P. Knekt, O. Lindfors, E. Heinonen, 2024, Nordic journal of psychiatry.

Research digest

P. Knekt, M. Laaksonen, B. Milrod, 2010 .