During the three-month period ended June 30, 2025, net revenue per adjusted admission increased by 8.6% while net revenue per adjusted patient day increased by 7.8%, as compared to the comparable quarter of 2024. During the three-month period ended June 30, 2025, as compared to the comparable prior year quarter, inpatient admissions and adjusted admissions to our behavioral health care hospitals increased by 0.6% and 0.4%, respectively. Patient days at these facilities increased by 1.4% and adjusted patient days increased by 1.2% during the three-month period ended June 30, 2025, as compared to the comparable prior year quarter. The average length of inpatient stay at these facilities was 13.6 days and 13.5 days during the three-month periods ended June 30, 2025 and 2024, respectively. The occupancy rate, based on the average available beds at these facilities, was 74% during each of the three-month periods ended June 30, 2025 and 2024.
On a Same Facility basis during the three-month period ended June 30, 2025, as compared to the comparable quarter of 2024, salaries, wages and benefits expense increased by $84 million or 9.4%. The increase during the second quarter of 2025, as compared to the comparable quarter of 2024, was due to a 5.4% increase in salaries, wages and benefits expense per average full time equivalent employee, as well as a 3.8% increase in the average number of full-time equivalent employees. As a percentage of net revenues during each quarter, salaries, wages and benefits expense increased to 53.3% during the second quarter of 2025 as compared to 53.1% during the second quarter of 2024.
Other operating expenses increased by $23 million, or 7.5%, during the second quarter of 2025, as compared to the comparable quarter of 2024. Contributing to the increase was a $3 million loss on sale of assets incurred during the second quarter of 2025, as well as a $4 million, or 18%, increase in the operating expenses of our commercial insurer. As a percentage of net revenues during each quarter, other operating expenses decreased to 18.1% during the second quarter of 2025 as compared to 18.3% during the second quarter of 2024.
Supplies expense increased by $1 million, or 2.5%, during the second quarter of 2025, as compared to the comparable quarter of 2024. As a percentage of net revenues during each quarter, supplies expense decreased to 3.2% during the second quarter of 2025, as compared to 3.4% during the comparable quarter of 2024.
Six-month periods ended June 30, 2025 and 2024:
During the six-month period ended June 30, 2025, as compared to the comparable prior year period, net revenues from our behavioral health services, on a Same Facility basis, increased by $239 million or 7.3%. Income before income taxes increased by $63 million, or 9.2%, amounting to $741 million or 21.0% of net revenues during the first six months of 2025, as compared to $678 million or 20.6% of net revenues during the first six months of 2024.
During the six-month period ended June 30, 2025, net revenue per adjusted admission increased by 7.9% while net revenue per adjusted patient day increased by 6.8%, as compared to the comparable period of 2024. During the six-month period ended June 30, 2025, as compared to the comparable prior year period, inpatient admissions and adjusted admissions to our behavioral health care hospitals decreased by 0.2% and 0.6%, respectively. Patient days at these facilities increased by 0.8% and adjusted patient days increased by 0.4% during the six-month period ended June 30, 2025, as compared to the comparable prior year period. The average length of inpatient stay at these facilities was 13.6 days and 13.5 days during the six-month periods ended June 30, 2025 and 2024, respectively. The occupancy rate, based on the average available beds at these facilities, was 74% and 73% during the six-month periods ended June 30, 2025 and 2024, respectively.
On a Same Facility basis during the six-month period ended June 30, 2025, as compared to the comparable period of 2024, salaries, wages and benefits expense increased by $141 million or 8.0%. The increase during the first six months of 2025, as compared to the comparable period of 2024, was due to a 4.2% increase in salaries, wages and benefits expense per average full time equivalent employee, as well as a 3.6% increase in the average number of full-time equivalent employees. As a percentage of net revenues during each quarter, salaries, wages and benefits expense increased to 53.8% during the first six months of 2025 as compared to 53.4% during the first six months of 2024.
Other operating expenses increased by $30 million, or 4.9%, during the first six months of 2025, as compared to the comparable period of 2024. As a percentage of net revenues during each period, other operating expenses decreased to 18.5% during the first six months of 2025 as compared to 18.9% during the first six months of 2024.
Supplies expense remained relatively unchanged during the first six months of 2025 and 2024, comprising 3.2% and 3.4% of net revenues during the six-month periods ended June 30, 2025 and 2024, respectively.
All Behavioral Health Care Services
The following table summarizes the results of operations for all our behavioral health care services during the three and six-month periods ended June 30, 2025 and 2024. These amounts include: (i) our behavioral health care results on a Same Facility basis, as indicated above; (ii) the impact of provider tax assessments which increased net revenues and other operating expenses but had no