AzTrials
AzTrials

Occupational AccidentsWEATHER-WORKNCT07750782

Environmental and Geographic Patterns of Occupational Injuries

An observational study of Occupational Accidents and Weather, run by Sergio Gabriel Susmallian at 1 site in Israel.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
Search all trials

Trial summary

This study will determine whether extreme ambient temperatures increase the incidence and severity of occupational injuries in Israel, and we request Helsinki Committee approval to conduct the analysis using de-identified National Insurance and historical meteorological data, with a waiver of informed consent. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Occupational Accidents, Weather
What is being tested?
Ambient Weather Exposure
How many people
350,000 participants
Where
1 siteIsrael
Study dates
1 Jan 2020to 31 Dec 2026
How long will I take part?
2 Years
Phase
Observational
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Study population: The study population will include adults aged 18 years or older with occupational injuries recognized by the National Insurance Institute between January 1, 2020, and December 31, 2024. Eligible records will be selected from the national occupational-injury administrative database and assigned to one of seven predefined geographic-climatic regions according to the workplace or accident location. Environmental exposure will be determined by linking each injury date, time, and location to the nearest representative meteorological monitoring station. The study will include workplace, occupational-traffic, and commuting injuries meeting the prespecified eligibility criteria.

Who may be able to join

  • Individuals aged 18 years or older with an occupational injury recognized by the National Insurance Institute.
  • Occupational injury occurring between January 1, 2020, and December 31, 2024.
  • Injury occurring at the workplace, during occupational travel, or while commuting to or from work.
  • Valid injury date and geographic information sufficient to assign the accident to one of the seven predefined geographic-climatic regions and the nearest representative meteorological station.
  • Meteorological measurements available for the injury period and eligible matched control periods.
  • For time-specific analyses, a valid recorded accident time permitting linkage to the closest preceding three-hour meteorological observation.

Who cannot join

  • Occupational diseases, repetitive-exposure conditions, or gradual-onset disorders without a clearly defined accident date.
  • Rejected, withdrawn, or unconfirmed occupational-injury claims.
  • Missing or invalid accident date or geographic information preventing linkage with meteorological data.
  • Accidents occurring outside the predefined geographic-climatic regions or beyond the prespecified maximum distance from an eligible meteorological station.
  • Duplicate or administratively repeated records referring to the same occupational-injury event.
  • Injury events for which no eligible matched control periods or corresponding meteorological measurements are available.
  • Individuals younger than 18 years.

Trial locations and contacts

1 site in 1 country.

Israel1 site
  • Israel National Insurance Institute

    Rishon LeZiyyon, 7526557

Other trials in Israel

About this study

Official title: Environmental and Geographic Patterns of Occupational Injuries: A Population-Based Retrospective Study

This study will determine whether extreme ambient temperatures increase the incidence and severity of occupational injuries in Israel, and we request Helsinki Committee approval to conduct the analysis using de-identified National Insurance and historical meteorological data, with a waiver of informed consent. The project will link the date, time, and geographic location of recognized occupational accidents with corresponding historical temperature and humidity measurements. The study is retrospective, observational, and involves no direct contact with participants, no intervention, and no alteration of medical care or benefit eligibility.

Read the detailed description

Occupational injuries represent an important source of preventable morbidity, permanent disability, loss of employment, and economic burden. Rising temperatures and increasingly frequent heatwaves may impair concentration, coordination, judgment, reaction time, hydration, and physical endurance, particularly among workers in construction, agriculture, transportation, manufacturing, and other outdoor or physically demanding occupations. However, the national relationship between ambient heat and work-related injury in Israel has not been adequately quantified. Without reliable population-level evidence, employers, occupational-health authorities, and policymakers cannot identify temperature thresholds at which preventive measures should be intensified or determine which workers and industries are at greatest risk.

Being tested
Ambient Weather Exposure

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Ambient Weather ExposureOther

    Ambient temperature, relative humidity, and wind speed at the occupational-injury location and time will be retrospectively obtained from the nearest representative meteorological monitoring station. Environmental exposures will be analyzed in relation to occupational-injury occurrence and severity.

Study groups in NCT07750782
Study groupRoleWhat they receive
Northern valleys and inland northOccupational injuries occurring in the northern valleys and inland northern region will be assigned to this geographic-climatic division according to the location of the workplace or accident. Meteorological exposure will be determined using data from the nearest representative monitoring station, including Dafna, Tavor Kadoorie, or Nazareth. This region is characterized by inland climatic conditions with substantial seasonal variation in temperature and humidity. Accident occurrence and severity will be evaluated in relation to temperature, relative humidity, wind speed, extreme heat, extreme cold, and other predefined environmental indicators.
Receives: Other: Ambient Weather Exposure
Northern Mediterranean coastOccupational injuries occurring along the northern Mediterranean coastal region will be assigned to this geographic-climatic division according to the location of the workplace or accident. Meteorological exposure will be determined using data from the Haifa Technion monitoring station or the nearest available representative station. This region is characterized by a Mediterranean coastal climate, with relatively high humidity, moderate winter temperatures, warm summers, and frequent sea-breeze effects. Accident occurrence and severity will be evaluated in relation to ambient temperature, relative humidity, wind speed, extreme heat, extreme cold, and other predefined environmental indicators.
Receives: Other: Ambient Weather Exposure
Central Mediterranean coastOccupational injuries occurring within the central Mediterranean coastal region will be assigned to this geographic-climatic division according to the workplace or accident location. Meteorological exposure will be determined using data from the Tel Aviv Coast monitoring station or the nearest available representative station. This region is characterized by a warm Mediterranean climate, relatively high humidity, mild winters, hot summers, and frequent sea-breeze effects. The occurrence and severity of occupational injuries will be evaluated in relation to ambient temperature, relative humidity, wind speed, extreme heat, extreme cold, and other predefined environmental indicators.
Receives: Other: Ambient Weather Exposure
Southern Mediterranean coastOccupational injuries occurring within the southern Mediterranean coastal region will be assigned to this geographic-climatic division according to the workplace or accident location. Meteorological exposure will be determined using data from the Ashqelon Port monitoring station or the nearest available representative station. This region is characterized by a warm coastal Mediterranean climate, relatively high humidity, mild winters, hot summers, and frequent sea-breeze effects. The occurrence and severity of occupational injuries will be evaluated in relation to ambient temperature, relative humidity, wind speed, extreme heat, extreme cold, and other predefined environmental indicators.
Receives: Other: Ambient Weather Exposure
Central highlandsOccupational injuries occurring within the central highlands region will be assigned to this geographic-climatic division according to the workplace or accident location. Meteorological exposure will be determined using data from the Jerusalem Centre monitoring station or the nearest available representative station. This region is characterized by higher elevation, lower average humidity than the coastal areas, greater day-night temperature variation, cooler winters, and warm, dry summers. The occurrence and severity of occupational injuries will be evaluated in relation to ambient temperature, relative humidity, wind speed, extreme heat, extreme cold, and other predefined environmental indicators.
Receives: Other: Ambient Weather Exposure
Negev desertOccupational injuries occurring within the Negev desert region will be assigned to this geographic-climatic division according to the workplace or accident location. Meteorological exposure will be determined using data from the Avdat monitoring station or the nearest available representative station. This region is characterized by an arid desert climate, very low relative humidity, intense solar exposure, high daytime temperatures, substantial day-night temperature variation, and limited rainfall. The occurrence and severity of occupational injuries will be evaluated in relation to ambient temperature, relative humidity, wind speed, extreme heat, extreme cold, and other predefined environmental indicators.
Receives: Other: Ambient Weather Exposure
Dead Sea and extreme arid regionOccupational injuries occurring within the Dead Sea and extreme arid region will be assigned to this geographic-climatic division according to the workplace or accident location. Meteorological exposure will be determined using data from the Massada monitoring station or the nearest available representative station. This region is characterized by very low elevation, an extremely hot and arid climate, low annual rainfall, intense solar radiation, prolonged periods of extreme heat, and substantial seasonal temperature variation. The occurrence and severity of occupational injuries will be evaluated in relation to ambient temperature, relative humidity, extreme heat, extreme cold, and other predefined environmental indicators. Wind speed will be analyzed when reliable measurements are available.
Receives: Other: Ambient Weather Exposure

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Occurrence of Recognized Occupational Injury During Case Versus Matched Control Periods

    The number of accepted occupational-injury events occurring during predefined case periods will be evaluated in relation to ambient temperature, relative humidity, and wind speed obtained from the nearest representative meteorological station. Each injury period will be compared with control periods matched by geographic-climatic region, calendar year and month, day of the week, and three-hour time interval. The association between environmental exposure and occupational-injury occurrence will be estimated using time-stratified case-crossover analysis with conditional logistic regression.

    Measured: At the index injury date and matched control dates, January 1, 2020-December 31, 2024.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted6 Aug 2026
  2. Study start1 Jan 2020
  3. Primary completion31 Dec 2024
  4. Study completion31 Dec 2026 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Observational
Observational model
Case crossover
Time perspective
Cross-sectional
Enrolment
350,000 participants (actual)
Target duration
2 Years
IDs, dates and publications
ClinicalTrials.gov ID
NCT07750782
Sponsor's protocol ID
BTL 001-2026
Other IDs
work accidents and weather
Acronym
WEATHER-WORK
Status last verified
Aug 2026
First submitted
2 Aug 2026
Last updated
7 Aug 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No: Individual participant data will not be publicly shared because the study uses confidential administrative records owned and controlled by the National Insurance Institute. Access is restricted to authorized researchers within a secure research environment and is governed by institutional confidentiality agreements, data-protection requirements, and applicable privacy legislation. The combination of accident dates, geographic information, occupational characteristics, and disability outcomes may create a residual risk of participant re-identification even after removal of direct identifiers. Only aggregated, disclosure-controlled results approved by the data custodian may be reported or published.

Publications

  • Calkins MM, Bonauto D, Hajat A, Lieblich M, Seixas N, Sheppard L, Spector JT. A case-crossover study of heat exposure and injury risk among outdoor construction workers in Washington State. Scand J Work Environ Health. 2019 Nov 1;45(6):588-599. doi: 10.5271/sjweh.3814. Epub 2019 Mar 14.

    PubMed 30869152
  • Sheng R, Li C, Wang Q, Yang L, Bao J, Wang K, Ma R, Gao C, Lin S, Zhang Y, Bi P, Fu C, Huang C. Does hot weather affect work-related injury? A case-crossover study in Guangzhou, China. Int J Hyg Environ Health. 2018 Apr;221(3):423-428. doi: 10.1016/j.ijheh.2018.01.005. Epub 2018 Jan 11.

    PubMed 29361390
  • Marinaccio A, Scortichini M, Gariazzo C, Leva A, Bonafede M, De' Donato FK, Stafoggia M, Viegi G, Michelozzi P; BEEP Collaborative Group. Nationwide epidemiological study for estimating the effect of extreme outdoor temperature on occupational injuries in Italy. Environ Int. 2019 Dec;133(Pt A):105176. doi: 10.1016/j.envint.2019.105176. Epub 2019 Oct 22.

    PubMed 31654985

Questions about this trial

What is this clinical trial studying?

An observational study of Occupational Accidents and Weather, run by Sergio Gabriel Susmallian at 1 site in Israel.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 6 inclusion and 7 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: under way, not looking for participants, as of the sponsor's last update on 7 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Israel. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Occurrence of Recognized Occupational Injury During Case Versus Matched Control Periods (time frame: At the index injury date and matched control dates, January 1, 2020-December 31, 2024.). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT07750782, which also lists 3 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 7 Aug 2026; AzTrials last refreshed its copy on 26 Oct 2026.

Free account

Keep searching with a free account

You’ve used your 3 free searches for this session. Log in or create a free AzTrials account to keep searching clinical trials and save the ones you want to follow.

Create a free accountLog in