Date of filling in this questionnaire or last update: 20/10/2021
Cohort name
  Norwegian Offshore Petroleum Workers (NOPW) Cohort

  • Norway

  Tom K Grimsrud
  Cancer Registry of Norway
Do you want to add another Principal Investigator of the Cohort

  • Add another Principal Investigator of the cohort

  Jo S Stenehjem
  Cancer Registry of Norway
Personal website


Name of committee
  Necessary legal and ethical approvals were obtained from the Norwegian Data Inspectorate, the Regional Committee for Medical Research Ethics and the Norwegian Directorate of Health.
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Contact Principal Investigator (name)
  Tom K Grimsrud
Data access policy (briefly describe)
  The data are held by the CRN. Requests for data sharing/case pooling may be directed to principal investigators Drs. Tom K Grimsrud [] or Jo S Stenehjem [].
Is this cohort part of a consortium? (name consortium)
Main aim of cohort, please briefly describe the main objectives of the cohort
  Studies of exposure-related cancer risk
Study design (please select as many as appropriate)

  • Prospective cohort
  • Nested case-control / Case-cohort

Source population (please select as many as appropriate)

  • Industry / occupation-based

Comparators (please select as many as appropriate)

  • Internal study population
  • External study population (includes SMR/SIR studies)

Inclusion criteria
  Engaged in offshore work on the Norwegian continental shelf once or more between 1965 and 1998
Age range at entry (main cohort)

Minimum Maximum Mean
19 80 42.6

Men at enrollment
  n=25347 male workers
Women at enrollment
  n=2570 female workers
Children (<18 years) at enrollment
Participation rate at enrollment (if known)
Type of data for outcome follow-up (please select as many as appropriate)

  • Disease incidence records

Disease incidence records (specify)

  • Cancer Registry
  • Cause of Death Registry

First follow-up period (provide year)
Last follow-up period (provide year)
Participation at last follow-up (if known)
  The cohort has not been updated with exposure information, but outcome information is reaily avaialable from registers (eg cancer, cause of death etc ) by linkage using a unique personal identification number (assign to all Norwegians at birth).
Source of exposure data collected (please select as many as appropriate)

  • Questionnaire, Personal (Self-reporting or interview)
  • Questionnaire, Personal (Occupational/industry modules)
  • Job-employment records

Occupational history/time frame
Occupational coding performed
Occupation (specify coding system used)

  • Local coding system designed specifically for job titles, job categories and main occupational activities in the offshore petroleum industry

Industry (specify coding system used)

  • Local coding system for the petroleum industry

Types of exposure measurements

  • Workplace sampling
  • Other (specify)

Methods for exposure assessment (please select as many as appropriate)

  • Expert assessment
  • Job Exposure Matrix
  • Measurements (external sampling, biomarkers)

Main categories

  • Dusts and fibres
  • Solvents
  • Metals and metal oxides
  • Other chemicals

Dusts and fibres | Fibres

  • Asbestos (any form of asbestos chrysotile, crocidolite, tremolite, anthophyllite, etc. or asbestos-containing material)
  • Ceramic fibres
  • Fibres (not specified)
  • Silicon carbide fibres and whiskers

Dusts and fibres | Inorganic dusts

  • Quartz (quartz or crystalline silica containing dusts)

Solvents | Aromatic hydrocarbon solvents

  • Benzene
  • Toluene
  • Xylene
  • Other (specify)

Solvents | Aromatic hydrocarbon solvents | Specify: Other
  crude oil skin; mineral oil inhalation, mineral oil inhalation; oil mist/vapour; exposure as a painter
Solvents | Chlorinated hydrocarbon solvents

  • Methylene chloride
  • Perchloroethylene
  • Trichloroethylene
  • Other (specify)

Solvents | Chlorinated hydrocarbon solvents | Specify: Other
  the JEM is named chlorinated degreasers and based on use of products contaning perch- or trichloroethylene
Solvents | Organic solvents, other than aliphatic, aromatic and chlorinated

  • Formaldehyde

Metals and metal oxides

  • Chromium (metallic chromium, Cr(iii), Cr(vi) and all compounds)
  • Lead and all compounds
  • Nickel and all compounds

Other chemicals | Detergents and cleaning products

  • Cleaning products
  • Detergents

Other chemicals | Engine exhaust

  • Diesel engine exhaust

Other chemicals | Welding fumes

  • Welding fumes, not specified

  A JEM on ionizing radiation is also avilable
Baseline - type of outcome data collected (select more than one if applicable)

  • Questionnaire, individual (self-recording or interview)

Outcome type (please select as many as appropriate)

  • Mortality
  • Morbidity

Diagnostic groups based on ICD10

  • C + D Neoplasms
  • D Diseases of blood and blood-forming organs excl. leukemia

C + D Neoplasms

  • Benign neoplasm
  • Carcinoma in situ
  • Leukemia
  • Malignant neoplasms gastro intes. system including liver, gall bladder, pancreas
  • Malignant neoplasm lung
  • Mesothelioma
  • Other malignant neoplasm of respiratory and intrathoracic organs, heart, pleura
  • Malignant neoplasm of bone and articular cartilage
  • Melanoma and other malignant neoplasms of skin
  • Neoplasms connective and soft tissue including nerves
  • Malignant neoplasm of breast
  • Malignant neoplasms, females gynecological
  • Malignant neoplasms of male genital organs
  • Malignant neoplasm of urinary tract and kidney
  • Malignant neoplasms of eye, brain and other parts of central nervous system
  • Malignant neoplasms of thyroid and other endocrine glands
  • Malignant neoplasms of ill-defined, secondary and unspecified sites
  • Malignant neoplasm without specification of site including excl. leukemia
  • Other, please state

D Diseases of blood and blood-forming organs excl. leukemia

  • Polycythaemia vera
  • Myelodysplastic syndromes

6. Other Information

  • Alcohol
  • Anthropometry
  • Demographics
  • Diet
  • Education
  • Physical exercise
  • Socioeconomic status
  • Smoking

Possibility for linkage to data registries/data enrichment via data linkage

  • Birth register
  • Cancer incidence
  • Disease specific clinical database
  • Medication usage
  • Mortality register

Please describe plans that are funded or most likely to be funded
  We are now establishing a new cohort of offshore petroleum workers that may be linked to the NOPW cohort to gather exposure information for the periode after 2000 onwards based on helicopter flight records. The cohort is called the Heliport cohort. Please see here for more information: