A ledger is actually a running account, including documents, work plans and work reports. Special population account refers to the work plan and report record of special population.
Special population refers to the group whose health or physical condition is not as good as that of healthy people, such as the old, the weak, the sick, the disabled and the pregnant. In this part of the population, dangerous patients such as cardiac and brain patients, orthopedic patients, cancer patients, early pregnant women, sick children, mild disabilities such as hearing impairment, mental retardation and so on.