The Effect of Blood Group on the Productivity of Wastewater Treatment Plant Operators

Study of ۱۰۰ WWTP operators in Tehran examined links between blood group and productivity indicators (fatigue, concentration, performance). O+ (۳۰%) and A+ (۲۵%) were most common; B+ (۴%) least. O− and O+ reported lower fatigue and higher concentration/performance; B+ and AB− showed opposite patterns. ANOVA showed significant group differences (p < ۰.۰۵). Tukey tests highlighted O− vs B+ (fatigue, concentration) and O+ vs AB− (performance). Regression controlling for age, gender, education, and experience identified O− as a predictor of lower fatigue (β = −۰.۲۸, p = ۰.۰۰۳) and higher concentration (β = +۰.۳۱, p = ۰.۰۰۱); O−/O+ predicted better performance (β = +۰.۲۶, p = ۰.۰۰۵). Education, shift type, and role also mattered: diploma/bachelor > master’s; rotating shifts > fixed; supervisors excelled despite more fatigue. Fatigue correlated negatively with concentration (r = −۰.۶۱) and performance (r = −۰.۵۲); concentration correlated positively with performance (r = +۰.۴۹). Biological and occupational factors jointly shape productivity.

کلیدواژه ها:

Blood group types ، Productivity indicators ، Job performance ، Wastewater treatment Operator