- Our study shows that BMI of seafarers working on ocean-going ships is higher than land workers (22.62 ± 3.88 / 20.26 ± 2.47) with p <0.05 Some characteristics of physiological cr of crew members of ocean going ships 19 The parameters of pulse frequency and blood pressure (both systolic and diastolic blood pressure) of the seafarers were statistically higher (p <0.05) than the labor group on land.