Objective This study was conducted to investigate the association between depressive symptoms and job stress, as measured by the KOSS, among Korean employees in small-and medium-sized enterprises, and examined which components of stress are involved in the risk for depression among males and females. Methods Data were collected from a work-stress survey of full-time employees of small-and medium-sized enterprises in Incheon, South Korea. A total of 3,013 participants were included in the analysis. Job stress was measured using 24 items (7 sub-scales) of the short form of Korean occupational stress scale (KOSS-SF), and depressive symptoms were evaluated using Center for epidemiologic studies depression scale (CES-D). Results After adjustment for confounding variables, most of subscales of job stress contributed to an increased risk of depressive symptoms, and job insecurity (male; OR = 2.02, 95%CI: 1.61-2.40, female; OR = 1.95, 95%CI: 1.42-2.70) and occupational climate (male; OR = 1.84, 95%CI: 1.49-2.28, female; OR = 1.78, 95%CI: 1.30-2.49) showed strong associations in both male and female. Other subscales revealed diVerent eVects for males and females; for males, job demands (OR = 1.68, 95%CI: 1.43-2.20), inadequate social support (OR = 1.55, 95%CI: 1.23-1.94), and lack of rewards (OR = 1.88, 95%CI: 1.48-2.37) were associated with depressive symptoms, whereas for females, organizational injustice (OR = 1.62, 95%CI: 1.14-2.30) was associated with depressive symptoms. Conclusion These results indicate that job stress may play a signiWcant role in increasing the risk of depressive symptoms, and that further preventive eVorts and research are needed to reduce job stress and address health problems caused by job stress among Korean employees.

(1) To compare the serum levels of Dickkopf-1 (DKK-1) and bone biomarkers in patients with ankylosing spondylitis (AS) and healthy controls. (2) To examine the effects of anti-tumor necrosis factor-α (TNF-α) therapy for 3 months on bone biomarkers in patients with AS. We measured the levels of DKK-1, osteocalcin, osteoprotegerin, and C-terminal telopeptide of type I collagen (CTX-1) in patients with AS and in healthy controls at baseline and 3 months after initiating anti-TNF-α therapy in AS patients. Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) scores were also measured before and after anti-TNF-α therapy in AS patients. Serum levels of DKK-1 were significantly lower in the AS patients than in the controls (P < 0.0001). Osteocalcin and osteoprotegerin levels were significantly higher in the AS patients than in the controls (P < 0.0001). Serum levels of DKK-1 were not changed after the 3-month anti-TNF-α therapy. Osteocalcin level increased (P < 0.0001), osteoprotegerin level and BASDAI scores decreased (P = 0.025 and P < 0.0001, respectively) significantly after the 3-months anti-TNF-α therapy. Serum DKK-1 level was lower in patients with AS than in healthy controls and did not change after 3 months of anti-TNF-α therapy in the AS patients despite the marked improvement in BASDAI scores. These findings suggest the low serum DKK-1 level is related to the pathogenesis of new bone formation in AS, which is resistant to TNF-α blocking therapy.

ObjectivesThe purpose of the present study was to identify the association between presenteeism and long working hours, shiftwork, and occupational stress using representative national survey data on Korean workers.MethodsWe analyzed data from the second Korean Working Conditions Survey (KWCS), which was conducted in 2010, in which a total of 6,220 wage workers were analyzed. The study population included the economically active population aged above 15 years, and living in the Republic of Korea. We used the chi-squared test and multivariate logistic regression to test the statistical association between presenteeism and working hours, shiftwork, and occupational stress.ResultsApproximately 19% of the workers experienced presenteeism during the previous 12 months. Women had higher rates of presenteeism than men. We found a statistically significant dose–response relationship between working hours and presenteeism. Shift workers had a slightly higher rate of presenteeism than non-shift workers, but the difference was not statistically significant. Occupational stress, such as high job demand, lack of rewards, and inadequate social support, had a significant association with presenteeism.ConclusionsThe present study suggests that long working hours and occupational stress are significantly related to presenteeism.

Background The aim of this study was to investigate whether job strain had an effect on the risk of occupational injury of workers at small‐ to medium‐sized manufacturing companies. Methods We conducted a prospective follow‐up survey and finally 1,209 workers in South Korea were included in this study. At time X1, we measured job stress with the Job Demand and Decision Latitude Questionnaire; and at time X2 (after 6 months), we evaluated occupational injuries through a single question. Occupational injuries were assessed using the question “Have you ever been injured at work, including minor scratches and cuts, in the previous four‐month period” by self‐reporting in the previous 4‐month period. Results For men, the high job‐demand group (OR = 1.71, 95% CI = 1.13–2.59) and high strain group (OR = 1.79, 95% CI = 1.02–3.14) showed the increased risk of occupational injury. For women, high job‐demand (OR = 2.11, 95% CI = 1.18–3.78), low job control (OR = 1.80, 95% CI = 1.02–3.17), and high job strain (OR = 3.57, 95% CI = 1.62–7.86) were significantly associated with occupational injury. Conclusion Workers under high job strain showed higher risk for occupational injury. The efforts to minimize stress‐related occupational injuries should be required. Am. J. Ind. Med. 52:322–330, 2009. © 2009 Wiley‐Liss, Inc.

The aim of this study was to determine whether skin temperature measurement by digital thermography on hands and feet is useful for diagnosis of Raynaud's phenomenon (RP). Fifty-seven patients with RP (primary RP, n = 33; secondary RP, n = 24) and 146 healthy volunteers were recruited. After acclimation to room temperature for 30 min, thermal imaging of palmar aspect of hands and dorsal aspect of feet were taken. Temperature differences between palm (center) and the coolest finger and temperature differences between foot dorsum (center) and first toe significantly differed between patients and controls. The area under curve analysis showed that temperature difference of the coolest finger (cutoff value: 2.2℃) differentiated RP patients from controls (sensitivity/specificity: 67/60%, respectively). Temperature differences of first toe (cutoff value: 3.11℃) also discriminated RP patients (sensitivity/specificity: about 73/66%, respectively). A combination of thermographic assessment of the coolest finger and first toe was highly effective in men (sensitivity/specificity : about 88/60%, respectively) while thermographic assessment of first toe was solely sufficient for women (sensitivity/specificity: about 74/68%, respectively). Thermographic assessment of the coolest finger and first toe is useful for diagnosing RP. In women, thermography of first toe is highly recommended.Graphical Abstract