Description: In this first edition of Occupational and Environmental Medicine for 2015 we have introduced a new front cover. We have decided to retire the ‘word cloud’, which has adorned the front cover since May 2012. This word cloud was based on the frequency of words contained in articles published in OEM prior to that date and after more than two and a half years it was becoming increasingly out of date. Our new front cover retains the blue colour scheme and continues the tradition of OEM being known as the ‘blue journal‘ amongst occupational health journals. The central feature of the new cover is a globe which signifies the wide reach of OEM around the world. For this first edition, we have selected a group of pictures which illustrate a range of hazardous working environments, as well as motor vehicle exhausts, an increasingly recognised contributor to a wide...

Description: Objectives The role of outdoor air pollution in the incidence of chronic obstructive pulmonary disease (COPD) remains unclear. We investigated this question using a large, nationally representative cohort based on primary care records linked to hospital admissions. Methods A cohort of 812 063 patients aged 40–89 years registered with 205 English general practices in 2002 without a COPD diagnosis was followed from 2003 to 2007. First COPD diagnoses recorded either by a general practitioner (GP) or on admission to hospital were identified. Annual average concentrations in 2002 for particulate matter with an aerodynamic diameter 〈10 µm (PM 10 ) and 〈2.5 µm (PM 2.5 ), nitrogen dioxide (NO 2 ), ozone and sulfur dioxide (SO 2 ) at 1 km 2 resolution were estimated from emission-based dispersion models. Hazard ratios (HRs) per interquartile range change were estimated from Cox models adjusting for age, sex, smoking, body mass index and area-level deprivation. Results 16 034 participants (1.92%) received a COPD diagnosis from their GP and 2910 participants (0.35%) were admitted to hospital for COPD. After adjustment, HRs for GP recorded COPD and PM 10 , PM 2.5 and NO 2 were close to unity, positive for SO 2 (HR=1.07 (95% CI 1.03 to 1.11) per 2.2 µg/m 3 ) and negative for ozone (HR=0.94 (0.89 to 1.00) per 3 µg/m 3 ). For admissions HRs for PM 2.5 and NO 2 remained positive (HRs=1.05 (0.98 to 1.13) and 1.06 (0.98 to 1.15) per 1.9 µg/m 3 and 10.7 µg/m 3 , respectively). Conclusions This large population-based cohort study found limited, inconclusive evidence for associations between air pollution and COPD incidence. Further work, utilising improved estimates of air pollution over time and enhanced socioeconomic indicators, is required to clarify the association between air pollution and COPD incidence.

Description: Objective To estimate associations between use of specific agricultural pesticides and incident diabetes in women. Methods We used data from the Agricultural Health Study, a large prospective cohort of pesticide applicators and their spouses in Iowa and North Carolina. For comparability with previous studies of farmers, we limited analysis to 13 637 farmers’ wives who reported ever personally mixing or applying pesticides at enrolment (1993–1997), who provided complete data on required covariates and diabetes diagnosis and who reported no previous diagnosis of diabetes at enrolment. Participants reported ever-use of 50 specific pesticides at enrolment and incident diabetes at one of two follow-up interviews within an average of 12 years of enrolment. We fit Cox proportional hazards models with age as the time scale and adjusting for state and body mass index to estimate HRs and 95% CIs for each of the 45 pesticides with sufficient users. Results Five pesticides were positively associated with incident diabetes (n=688; 5%): three organophosphates, fonofos (HR=1.56, 95% CI 1.11 to 2.19), phorate (HR=1.57, 95% CI 1.14 to 2.16) and parathion (HR=1.61, 95% CI 1.05 to 2.46); the organochlorine dieldrin (HR=1.99, 95% CI 1.12 to 3.54); and the herbicide 2,4,5-T/2,4,5-TP (HR=1.59, 95% CI 1.00 to 2.51). With phorate and fonofos together in one model to account for their correlation, risks for both remained elevated, though attenuated compared with separate models. Conclusions Results are consistent with previous studies reporting an association between specific organochlorines and diabetes and add to growing evidence that certain organophosphates also may increase risk.

Description: Background Ambient air pollution has been consistently associated with exacerbation of respiratory diseases in schoolchildren, but the role of early exposure to traffic-related air pollution in the first occurrence of respiratory symptoms and asthma is not yet clear. Methods We assessed the association between indexes of exposure to traffic-related air pollution during different periods of life and respiratory outcomes in a birth cohort of 672 newborns (Rome, Italy). Direct interviews of the mother were conducted at birth and at 6, 15 months, 4 and 7 years. Exposure to traffic-related air pollution was assessed for each residential address during the follow-up period using a Land-Use Regression model (LUR) for nitrogen dioxide (NO 2 ) and a Geographic Information System (GIS) variable of proximity to high-traffic roads (HTR) (〉10 000vehicles/day). We used age-specific NO 2 levels to develop indices of exposure at birth, current, and lifetime time-weighted average. The association of NO 2 and traffic proximity with respiratory disorders were evaluated using logistic regression in a longitudinal approach (Generalised Estimating Equation). The exposure indexes were used as continuous and categorical variables (cut-off points based on the 75th percentile for NO 2 and the 25th percentile for distance from HTRs). Results The average NO 2 exposure level at birth was 37.2 μg/m 3 (SD 7.2, 10–90th range 29.2–46.1). There were no statistical significant associations between the exposure indices and the respiratory outcomes in the longitudinal model. The odds ratios for a 10-µg/m 3 increase in time-weighted average NO 2 exposure were: asthma incidence OR=1.09; 95 CI% 0.78 to 1.52, wheezing OR=1.07; 95 CI% 0.90 to 1.28, shortness of breath with wheezing OR=1.16; 95 CI% 0.94 to 1.43, cough or phlegm apart from cold OR=1.11; 95 CI% 0.92 to 1.33, and otitis OR=1.08; 95 CI% 0.89 to 1.32. Stronger but not significant associations were found considering the 75th percentile of the NO 2 distribution as a cut-off, especially for incidence of asthma and prevalence of wheeze (OR=1.41; 95 CI% 0.88 to 2.28 and OR=1.27; 95 CI% 0.95 to 1.70, respectively); the highest OR was found for wheezing (OR=2.29; 95 CI% 1.15 to 4.56) at the 7-year follow-up. No association was found with distance from HTRs. Conclusions Exposure to traffic-related air pollution is only weakly associated with respiratory symptoms in young children in the first 7 years of life.

Description: Objectives This study presents an investigation of first-time decisions regarding work injury annuity due to occupational disease. Focus is a number of potential underlying factors behind the gender gap, where women are disadvantaged, in the granting of work injury annuity. Methods All 99 subjects (80 men and 19 women) who met the conditions of long-lasting reduction of work ability due to occupational disease (not occupational accident) in the Swedish Work Injury Insurance Act and were granted work injury annuity in 2010, together with a random sample of 118 subjects (55 men and 63 women) who were denied annuity in the same year, were selected for analysis. Each subject's case file from the Social Insurance Agency was examined with regards to cause of disease, diagnosis and the Social Insurance Agency's management and decision making of claims. The data were analysed by logistic regression analysis. Results Men had a higher probability of being granted work injury annuity than women for musculoskeletal disorders (OR 4.16), mental disorders (OR 7.93) and diseases in other diagnostic chapters (OR 3.65). After adjustment for age, country of birth, diagnosis, work exposure factors and decision support factors, the higher probability for men of being granted work injury annuity remained (full model: OR 2.67, 95% CI 1.20 to 5.94). Conclusions Actions are necessary in order to establish equitable and gender-neutral treatment of work injury insurance claims. There is a need for more detailed knowledge of exposures in female-dominated jobs and the relationship between these exposures and occupational disease.

Description: Objectives To characterise occupational wheat allergic phenotypes (rhino-conjunctivitis, asthma and dermatitis) and immunoglobulin (IgE) sensitisation to particular wheat allergens in bakers. Methods We conducted clinical and immunological evaluations of 81 consecutive bakers reporting occupational symptoms using commercial tests (skin prick test (SPT), specific IgE, ISAC microarray) and six additional dot-blotted wheat allergens (Tri a 39, Tri a Trx, Tri a GST, Tri a 32, Tri a 12, Tri a DH). Results Wheat SPT resulted positive in 29 bakers and was associated with work-related asthma (p〈0.01). Wheat IgE was detected in 51 workers and was associated with work-related asthma (p〈0.01) and rhino-conjunctivitis (p〈0.05). ISAC Tri a 30 was positive in three workers and was associated with work-related dermatitis (p〈0.05). Wheat dot-blotted allergens were positive in 22 bakers. Tri a 32 and Tri a GST were positive in 13 and three bakers, respectively, and both were associated with work-related dermatitis (p〈0.05). This association increased (p〈0.01) when Tri a 32, Tri a GST and Tri a 30 were analysed together (p〈0.01). Wheat IgE levels were associated with work-related dermatitis (p〈0.01). Conclusions Wheat IgE levels and wheat microarrayed allergens may be associated with some occupational allergic phenotypes. The extension of the panel of wheat allergens may be promising for discriminating the clinical manifestations of baker's allergy.

Description: Background Between 2001 and 2010, six research groups conducted coordinated multiyear, prospective studies of carpal tunnel syndrome (CTS) incidence in US workers from various industries and collected detailed subject-level exposure information with follow-up symptom, physical examination, electrophysiological measures and job changes. Objective This analysis of the pooled cohort examined the incidence of dominant-hand CTS in relation to demographic characteristics and estimated associations with occupational psychosocial factors and years worked, adjusting for confounding by personal risk factors. Methods 3515 participants, without baseline CTS, were followed-up to 7 years. Case criteria included symptoms and an electrodiagnostic study consistent with CTS. Adjusted HRs were estimated in Cox proportional hazard models. Workplace biomechanical factors were collected but not evaluated in this analysis. Results Women were at elevated risk for CTS (HR=1.30; 95% CI 0.98 to 1.72), and the incidence of CTS increased linearly with both age and body mass index (BMI) over most of the observed range. High job strain increased risk (HR=1.86; 95% CI 1.11 to 3.14), and social support was protective (HR=0.54; 95% CI 0.31 to 0.95). There was an inverse relationship with years worked among recent hires with the highest incidence in the first 3.5 years of work (HR=3.08; 95% CI 1.55 to 6.12). Conclusions Personal factors associated with an increased risk of developing CTS were BMI, age and being a woman. Workplace risk factors were high job strain, while social support was protective. The inverse relationship between CTS incidence and years worked among recent hires suggests the presence of a healthy worker survivor effect in the cohort.

Description: Objectives To quantify the risk for carpal tunnel syndrome (CTS) from workplace physical factors, particularly hand activity level and forceful exertion, while taking into account individual factors including age, gender, body mass index (BMI), and pre-existing medical conditions. Methods Three healthcare and manufacturing workplaces were selected for inclusion on the basis of range of exposure to hand activity level and forceful exertion represented by their jobs. Each study participant's job tasks were observed and evaluated onsite and videotaped for further analysis, including frequency and duration of exertion and postural deviation. Individual health assessment entailed electrodiagnostic testing of median and ulnar nerves, physical examination and questionnaires at baseline with annual follow-up for 2 years. Results The incidence of dominant hand CTS during the study was 5.11 per 100 person-years (29 cases). Adjusted HRs for dominant hand CTS were as follows: working with forceful exertion ≥20% but 〈60% of the time: 2.83 (1.18, 6.79) and ≥60% of the time vs 〈20%: 19.57 (5.96, 64.24), BMI ≥30 kg/m 2 (obesity): 3.19 (1.28, 7.98). The American Conference for Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV) for hand activity level also predicted CTS, HR=1.40 (1.11, 1.78) for each unit increase in the TLV ratio, controlling for obesity and job strain. Conclusions Workplace and individual risk factors both contribute to the risk for CTS. Time spent in forceful exertion can be a greater risk for CTS than obesity if the job exposure is high. Preventive workplace efforts should target forceful exertions.

Description: Background Privatisations of public sector organisations are not uncommon, and some studies suggest that such organisational changes may adversely affect employee health. In this study, we examined whether transfer of work from public sector hospital units to commercial enterprises, without major staff reductions, was associated with an increased risk of long-term sickness absence among employees. Methods A cohort study of 962 employees from four public hospital laboratory and radiology units in three hospitals which were privatised during the follow-up and 1832 employees from similar units without such organisational changes. Records of new long-term sick leaves (〉90 days) were obtained from national health registers and were linked to the data. Mean follow-up was 9.2 years. Results Age- and sex-adjusted HR for long-term sickness absence after privatisation was 0.83 (95% CI 0.68 to 1.00) among employees whose work unit underwent a change from a public organisation to a commercial enterprise compared with employees in unchanged work units. Further adjustments for occupation, socioeconomic status, type of job contract, size of residence and sick leaves before privatisation had little impact on the observed association. A sensitivity analysis with harmonised occupations across the two groups replicated the finding (multivariable adjusted HR 0.92 (0.70–1.20)). Conclusions In this study, transfer of work from public organisation to commercial enterprise did not increase the risk of long-term sickness absence among employees.

Description: Objectives To study the employment and occupational outcomes of workers who were diagnosed with upper limb musculoskeletal disorders (UL-MSDs) or had complained of upper limb musculoskeletal pain a few years before compared with workers who had no upper limb pain. Methods In 2002–2005, an epidemiological surveillance system was set up. Occupational physicians examined 3710 randomly selected workers. It focused on six UL-MSDs: rotator cuff syndrome, lateral epicondylitis, flexor-extensor peritendinitis of the hands and fingers, de Quervain's disease, carpal tunnel syndrome and ulnar tunnel syndrome. Three groups were constituted: a ‘UL-MSD’ group (workers with a clinically diagnosed UL-MSD at baseline, 13% of the cohort); a ‘PAIN’ group (workers with pain in the previous 7 days at baseline and without any clinically diagnosed form, 38%); and a ‘HEALTHY’ group (workers with no disorder or upper limb pain in the previous 7 days, 49%). They completed a questionnaire between 2007 and 2009. Results A total of 2332 responded. Fewer subjects were still in work in the ‘UL-MSD’ group (79.3%) than in the ‘PAIN’ (85.9%) and ‘HEALTHY’ (90.4%) groups, the difference remaining significant after adjusting for gender, age, occupational category, type of company and comorbidities. Of the subjects still in work, 24% had changed their work station in the same company in the ‘PAIN’ group compared with 19% in the ‘HEALTHY’ group and 21% in the ‘UL-MSD’ group. Conclusions This study showed the impact of musculoskeletal pain on employment outcome and the difficulty of keeping workers with musculoskeletal problems at work.