The phrase "assessments were based on" is correct and usable in written English.
You can use it when discussing the criteria or factors that influenced the evaluations or judgments made in a particular context.
Example: "The final grades for the course were determined by various factors, and the assessments were based on students' performance in both exams and projects."
Alternatives: "evaluations were grounded in" or "judgments were derived from".
In all studies, pharmacokinetic assessments were based on the FVII coagulant activity (FVII C) assay, a one-stage assay using thromboplastin tissue factor, which quantifies FVII clotting activity in plasma (Capio Diagnostik A/S, Denmark) [ 21].
In all but one study (Dadvand et al. 2011a), exposure assessments were based on the routine measurements of air pollutant concentrations at fixed-site air pollution monitoring stations.
All safety and tolerability assessments were based on the safety population, defined as all subjects who received at least one dose of study material.
Safety assessments were based on the safety population, which included all patients who received at least one dose of study medication.
Risk assessments were based on the proband, and maternal or paternal inheritance was assessed using the Progeny program (Progeny Software, LLC, South Bend, IN, USA).
The environmental and economic assessments were based on life cycle cost and life cycle assessment.
The Inland Revenue's demanded assessments were based on their calculations from 6 years ago, when she received 3500 pounds from her godmother.
In addition, assessments were based on requirement criteria that have been higher than hitherto and that have been shaped in an efficient military system.
Both assessments were based on randomized, stratified samples of hospitals and were conducted in collaboration with the Ugandan Ministry of Health.
Optimal monitoring configurations varied amongst species, locations and whether assessments were based on power, precision or accuracy.
The 39,437 criminal assessments were based on 73,303 complaints received by the F.B.I., indicating that about half of the time, agents merely filled out a complaint form but saw nothing worth following up on.
