Table 1

Measurements at baseline and follow-ups in Post-crash Traffic Safety and Health Cohort Study, Prospective Epidemiological Research Studies in IrAN

PhaseSourceMeasurements/toolsMeasurements: in-person/online video call/phone call
Baseline*
(September 2019–March 2022)		Integrated Road Traffic Injury Registry System,
Hospital Information System
Emergency Medical Services		Codes of International Classification of Diseases version 10, relative value unit, vital signs, Glasgow Coma Scale, O2 saturation, injury severity, delivered care, surgical code, invasive procedures, pharmaceutical therapy, surgery, length of stay, complications and costsDemographic data, crash-related, environment-related, vehicle-related data, behavioural information†
F-up1*
(5000 target sample: October 2019–October 2022)
(10 000 target sample: November 2022–December 2032)		Questionnaires
Laboratory tests		Demographic information,‡ economic information,§ Child Stress Disorders Checklist-Short Form, post-traumatic stress disorder, Public Health Quality, Europe Quality of Life-5 dimensions-3 levels, socioeconomic statusCounselling with a licensed psychiatrist/practitioner,
Questionnaires: WHO Disability Assessment Schedule 2.0, Montreal Cognitive Assessment, Holmes-Rahe Life Stress Inventory, CONNERS adult deficit/hyperactivity disorder, traffic profile, Pittsburgh Sleep Quality Index, Traffic Behaviour Questionnaires
Laboratory tests: health examinations, driving performance and psychophysiological tests, hearing and vision screening tests, blood samples¶ (anaemia, diabetes (if diabetic, A1C))
F-up2*
(March 2020–March 2032)		Questionnaires
Laboratory tests		Same as F-up1, Child Symptom Inventory version 4, WHO Disability Assessment Schedule 2.0Same as F-up1
F-up3*
(October 2020–September 2032)		Questionnaires
Laboratory tests		Same as F-up1, Child Symptom Inventory version 4Same as F-up1
F-up4*
(October 2021–September 2033)		Questionnaires
Laboratory tests		Same as F-up3Same as F-up1
F-up5*
(October 2022–September 2034)		Questionnaires
Laboratory tests		Same as F-up3Same as F-up1
TrienniallyQuestionnaires
Laboratory tests		Same as F-up3Other potential measurements: hair/serum glucocorticoids as indicators of acute stress, cognitive assessments, baseline mental health assessments, traffic violation records and repeated traffic collisions

  • *Registered patients information on which all follow-ups are based, F-up1 stands for 1-month follow-up, F-up2 for 6-month follow-up, F-up3 for 12-month follow-up, F-up4 for 24-month follow-up and F-up5 for 36-month follow-up.

  • †Road Traffic Injury Registry tool (time, place and crash mechanism and the weather condition, victims’ traffic role, used/counterpart vehicle, Glasgow Coma Scale, Revised Trauma Scale, Glasgow Outcome Scale, socioeconomic status, road collision in sketch lines).

  • ‡Self-reported demographic information: for ≤18 years: child full name, family relationship with the injured person, hospital name, file and identification number, birth date, date of traffic collision/filling the questionnaire/death; for >18 years: full name, hospital name, file and identification number, date of birth/traffic collision/filling the questionnaire/death.

  • §Self-reported economic information: for ≤18 years: direct medical and non-medical costs, indirect and intangible costs (the amount of damage to the vehicle, the amount paid by insurance company/paid out of pocket, costs of rehabilitation and physiotherapy per session, other medical and non-medical costs after discharge (readmission, doctor visit, diagnostic and laboratory services, medicine, forensic medicine, transportation to receive healthcare, accommodation, other costs), household’s purchase power, job of the head of household; for >18 years: same as that for children plus two additional items (changes in (your/household’s) purchase power/job, job title before/after RTC).

  • ¶At this stage, hearing and vision screening tests, and blood sampling have not been started due to the epidemic COVID-19.