Age-related and Gender-related Differences in Hospital Admission Rate and Hospital Costs of People Covered by the Iran Health Insurance Organization: A Retrospective Study

The impact of population aging on health expenditure is inevitable. It affects health expenditure by causing changes in people’s health status and the demand for health care services. In this study, we aim to investigate the age-related and gender-related differences in hospital admission rate, length of stay, and hospital costs of people in Iran.

This is a quantitative, descriptive-analytical study with a cross-sectional design conducted on data of 41 million Iranian people covered by the Iran Health Insurance Organization in 2020. Hospital admission rate, length of stay, and hospital costs were dependent variables. Hospital costs included insurance payments, patients’ out-of-pocket spending, and government subsidies. Age and sex of the patients, ownership of the hospital, type of patients’ medical files were descriptive variables. The Mann-Whitney U test was used to compare hospital costs between elderly (>60 years of age) and non-elderly (<60 years of age) groups and between females and males. Spearman’s correlation test was used to find the correlation between age and dependent variables. 

During the study period, there were about 3,800,000 hospital admissions. The rate of hospital admission in the elderly was 3.7 times higher than that of non-elderly groups. The average length of stay was 1.3 days for the elderly, and 2.2 days for the non-elderly. In the elderly group, men had a higher hospital admission rate than women, while in non-elderly groups, women had a higher admission rate. The average hospital cost was 28 million IRR for the non-elderly and 45 million IRR for the elderly. The average cost of surgery, hospitalization, medicine and medical consumables for the elderly was 1.5 times more than that of the non-elderly. There was a positive and significant relationship between the hospital admission rate and age of the patients (r=0.879, P<0.001). As the age of the patients increased, the length of stay in the hospital increased significantly (r=0.582, P<0.001). The relationship between patients’ age and the average hospital cost was also positive and significant (r=0.582, P=0.006).

Hospital admission rate, length of stay, and average hospital costs are significantly higher for the elderly in Iran.