Adam N. Satterfield
Executive Vice President - Finance, Chief Financial Officer and Assistant Secretary at Old Dominion Freight Line
Thank you, Marty, and good morning. Old Dominion's revenue for the fourth quarter of 2023 was $1.5 billion, which was a 0.3% increase from the prior year. This slight increase in revenue was primarily due to a 3.0% increase in LTL revenue per hundredweight that more than offset the 2.0% decrease in LTL tons per day. Our quarterly operating ratio was 71.8% and earnings per diluted share were $2.94, which was a 0.7% increase from last year. As Marty previously mentioned, this was the first quarter with an increase in both revenue and earnings per diluted share since the fourth quarter of last year. While it certainly has not felt like one of our record years from the past, $2.94 also represents a new Company record for fourth quarter earnings per diluted share.
On a sequential basis, our revenue per day for the fourth quarter increased 1.9% when compared to the third quarter 2023 with LTL tons per day increasing 0.6% and LTL shipments per day decreasing 0.3%. For comparison, the 10-year average sequential change for these metrics includes a decrease of 0.8% in revenue per day, a decrease of 1.6% in tons per day, and a decrease of 3.4% in shipments per day. The monthly sequential changes in LTL tons per day during the fourth quarter were as follows: October decreased 0.7% as compared to September, November decreased 0.6% from October, and December decreased 4.8% as compared to November. The 10-year average change for these respective months is a decrease of 3.5% in October, an increase of 3.5% in November, and a decrease of 8.0% in December.
For January, we expect our revenue per day will decrease approximately 3.1% as compared to January of 2023 with a decrease of approximately 5.1% in our LTL tons per day. These numbers could be plus or minus 10 basis points or 20 basis points, depending upon today's revenue performance. We expect our revenue per hundredweight, excluding fuel surcharges, will increase approximately 6.4%, which is generally in line with normal seasonality for this metric. We will file the actual revenue-related details for January in our Form 10-K.
Our operating ratio increased 60 basis points to 71.8% for the fourth quarter. We continued to operate efficiently during the quarter despite the lack of network density, but our direct operating costs increased as a percent of revenue. The increase in these costs was primarily due to an increase in our insurance and claims expense as a percent of revenue, which is attributable to changes in the annual adjustment we record in our fourth quarter each year relating to our third-party actuarial reviews. We were otherwise pleased with our control over direct operating costs during the quarter as our team did a nice job of matching labor to current revenue trends.
While our LTL shipments per day increased, our average headcount was down 4.1% when compared to the fourth quarter 2022. We currently believe that our workforce is appropriately sized for our current shipment trends, but we will likely need to add to our workforce this year as volumes begin to improve.
Our overhead cost also increased as a percent of revenue despite our best efforts to control discretionary spending. Depreciation expense as a percent of revenue increased 80 basis points when compared to the fourth quarter of 2022, due primarily to the execution of our 2023 capital expenditure plan. The increases in depreciation and other overhead costs were partially offset by a 90 basis point improvement in our miscellaneous expenses as a percent of revenue, which included $15.1 million of gains on the disposal of property and equipment.
Old Dominion's cash flow from operations totaled $436.7 million for the fourth quarter and $1.6 billion for the year, while capital expenditures were $105.9 million and $757.3 million for the same respective periods. We utilized $85.5 million and $453.6 million of cash for our share repurchase program during the fourth quarter and 2023 respectively, while cash dividends totaled $43.6 million and $175.1 million for the same periods. We were pleased that our Board of Directors approved a 30% increase for the quarterly dividend to $0.52 per share for the first quarter of 2024.
Our effective tax rate for the fourth quarter of 2023 was 24.1% as compared to 25.0% in the fourth quarter of 2022. We currently anticipate our annual effective tax rate to be 25.6% for 2024.
This concludes our prepared remarks this morning. And operator, we'll be happy to open the floor for questions at this time.