ABO/rhesus D blood systems and health indices: a preliminary study to find an association among healthy dwellers of Anuradhapura, Sri Lanka

A total of 100 participants were recruited. The blood group in Driving License (67%), Pregnancy Record (17%), Blood Donation Card (11%), Laboratory Report (03%), Old Boy Identity Card (01%), and Service Identity Card (01%) matched the laboratory blood grouping in all participants. The O blood group had significantly fewer hours of sleep per day (P = 0.03) and significantly narrower pulse pressure (P = 0.02) than the non-O blood group. Also, the O + blood group had significantly fewer hours of sleep per day than the A + blood group (P < 0.01). Evidence in the literature is scarce to support these findings. Future large-scale studies among healthy and patient populations are necessary for confirmation.