Thank you, Mark, and good morning, everyone. As Mark said, I'll run through our results for the first quarter of 2024. For the period, net sales decreased 6% to $67.9 million from $72.5 million in the 2023 period, primarily due to lower demand for truck accessories and returnable transport packaging products, partially offset by strong orders for truck mirror assemblies.
During the quarter, distributors continue to work through inventories built up in response to supply chain challenges. But based on our recent conversations with our distributor customers and current order activity, we believe this process is finally winding down. As Mark mentioned, our backlog as of March 30, 2024, increased 22% to $97.4 million compared to $80.1 million as of December 30, 2023.
The increase was driven by orders for truck mirror assemblies, including the launch of Velvac's new mirror program for Class 8 trucks. Gross margin as a percentage of sales in the first quarter was 24% compared to 21% in the 2023 period. The increase in margin primarily reflects improved price cost alignment and various other cost-saving initiatives. As a percentage of net sales, product development expenses were 2% compared to 1.9% for the 2023 quarter.
Selling and administrative expenses decreased 4% for the first quarter of 2024 compared to last year's period. The decrease was primarily due to lower legal, professional selling costs and payroll expenses. Other income and expense for the first quarter of 2024 increased $0.6 million compared to the 2023 period. The increase in other income of $0.6 million was primarily driven by unfavorable working capital adjustment of $0.4 million in the 2023 period related to the sale of the Greenwald business. Net income for the first quarter of 2024 increased to $1.9 million or $0.31 per diluted share from $0.6 million or $0.10 per diluted share in the 2023 period.
In the first quarter of 2023, net income was negatively impacted by $1.8 million in severance expenses related to the elimination of the Chief Operating Officer position, the departure of the Chief Executive Officer and a $0.4 million related to the sale of the Greenwald business, partially offset by $0.5 million for the non-GAAP tax impact of the adjustments.
Adjusted EBITDA, a non-GAAP measure, for the first quarter of 2024 was $5.2 million compared to $5.5 million for the first quarter of 2023. At the end of the first quarter, our senior net leverage ratio was 1.4:1, down from 2.05 at the end of the 2023 period. In addition, we invested $1.8 million in capital expenditures and paid dividends of $0.7 million.
For the first quarter, cash flow from operating activities was $3.6 million compared to $6.9 million for the last year's period. The difference was primarily due to increases in accounts receivable and lower reductions in inventory, partially offset by accounts payable. As of March 30, 2024, inventories totaled $55.8 million, a decrease of $3.5 million from year-end 2023.
That completes my financial review. I'll now turn the call back to Mark.