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Relative Risk01:12

Relative Risk

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Relative risk (RR) is a statistical measure commonly used in epidemiology to compare the likelihood of a particular event occurring between two groups. This metric is important for evaluating the relationship between exposure to a specific risk factor and the probability of a particular outcome. It plays a crucial role in medical research, public health studies, and risk assessment. Relative risk quantifies how much more (or less) likely an event is to occur in an exposed group compared to an...
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Related Experiment Video

Updated: Jan 7, 2026

The Goeckerman Regimen for the Treatment of Moderate to Severe Psoriasis
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Distinct Mortality Risks in Generalized Pustular Psoriasis and Palmoplantar Pustulosis: A Nationwide,

Jae Joon Jeon1,2, Solam Lee1,3, Yoon-Seob Kim4

  • 1Department of Dermatology, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea.

Dermatology (Basel, Switzerland)
|December 16, 2025
PubMed
Summary

Generalized pustular psoriasis (GPP) increases mortality risk compared to psoriasis vulgaris (PV), while palmoplantar pustulosis (PPP) shows lower mortality. These findings highlight distinct epidemiological differences among psoriasis subtypes.

Keywords:
EpidemiologyIncidenceMortalityPalmoplantar pustulosisPsoriasisPustular psoriasis

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Area of Science:

  • Dermatology
  • Epidemiology
  • Public Health

Background:

  • Psoriasis subtypes, including generalized pustular psoriasis (GPP), palmoplantar pustulosis (PPP), and psoriasis vulgaris (PV), exhibit varying clinical presentations.
  • Understanding the differential impacts of these subtypes on patient mortality is crucial for comprehensive healthcare management.

Purpose of the Study:

  • To compare all-cause and cause-specific mortality rates among patients diagnosed with GPP, PPP, and PV.
  • To elucidate potential epidemiological and biological distinctions between these psoriasis forms.

Main Methods:

  • A nationwide, retrospective cohort study was conducted using Korean National Health Insurance Service and National Death Registry data (2002-2022).
  • Patients (≥18 years) with GPP, PPP, or PV were identified based on diagnosis codes and followed from an index date until death, emigration, or study end.
  • Inverse probability weighting was employed to balance baseline characteristics including demographics, health data, socioeconomic status, and comorbidities.

Main Results:

  • Patients with GPP demonstrated significantly higher all-cause mortality compared to PV (aHR, 1.23; 95% CI, 1.20-1.25).
  • Conversely, PPP was associated with lower all-cause mortality (aHR, 0.89; 95% CI, 0.87-0.91).
  • GPP showed increased mortality from hematologic and respiratory diseases, while PPP had decreased mortality from gastrointestinal and infectious diseases.

Conclusions:

  • Generalized pustular psoriasis (GPP) is linked to elevated all-cause and cause-specific mortality relative to psoriasis vulgaris (PV).
  • Palmoplantar pustulosis (PPP) is associated with reduced mortality.
  • These findings underscore significant epidemiological and potential biological differences across psoriasis subtypes.