Related Experiment Video
Updated: Feb 15, 2026

Author Spotlight: Quantifying Pain Experience – An Illustrative Approach Using the Pain Body Diagram
Published on: July 7, 2023
Factors associated with participant and provider pain rating during office-based first-trimester vacuum aspiration
Johana D Oviedo1, N Tanya Ohly1, Jacqueline M Guerrero1
1Department of Obstetrics and Gynecology, Columbia University Medical Center, New York, NY 10032, USA.
Objective:
The objective was to describe factors associated with reported pain and assess correlations between participant and provider pain assessments during first-trimester vacuum aspiration.
Study Design:
Participants and providers in a trial evaluating music for pain reduction reported procedure-related pain using a 100-mm visual analog scale.
Results:
The mean participant-reported maximum pain was 65.9±23.0 compared to 41.3±22.0 by provider assessment. Provider-reported scores correlated poorly with participant maximum pain (r=0.28) and participant maximum pain adjusted for baseline (r=0.27). Previous abortion (60.5 versus 71.4, p=.02) and immediate intrauterine device insertion (46.1 versus 68.6, p=.03) were associated with lower participant-reported pain.
Conclusions:
Providers underestimate pain reported during vacuum aspiration; provider estimates correlate poorly with participant self-report.
Implications:
To improve management of pain during first-trimester vacuum aspiration, we need to better understand factors that influence patient and provider pain rating. When assessing patient pain in this setting, providers should not assume a baseline of zero pain.
Related Concept Videos
Factors Influencing Heart Rate
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
Factors Influencing the Rate of Chemical Reactions
Concentration and Pressure:
The more particles present within a given space, the more likely those particles are to bump into one another....
Factors Affecting Drug Distribution: Organ Perfusion Rate
Perfusion rate-limited distribution relies on the...
Transcription Factors
Pain
Temperature Dependence on Reaction Rate
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...

