Selling, general and administrative expenses for the three months ended July 31, 2023 and 2022 were $10.5 million, or 7.4% of corresponding consolidated revenues, and $11.0 million, or 9.3% of corresponding consolidated revenues, respectively.
Other income, net, for the three months ended July 31, 2023 was $4.1 million, which substantially related to income earned during the period on funds invested in a money market fund, CDs and U.S. Treasury notes.
For the three months ended July 31, 2023, income tax expense was $4.6 million which represented an effective income tax rate of 26.5%. For the three months ended July 31, 2022, income tax expense was $9.7 million, which included an unfavorable adjustment in the approximate amount of $6.2 million that was related to the settlement of research and development credit claims with the IRS. Excluding the effect of the IRS settlement, our effective income tax rate for the three months ended July 31, 2022 was 25.2%.
Consolidated revenues for the six months ended July 31, 2023 were $245.0 million, which represented an increase of $26.6 million, or 12.2%, from consolidated revenues of $218.4 million reported for the six months ended July 31, 2022 with the increase reflecting primarily the revenue increases achieved for the second quarter.
Consolidated gross profit for the six-month period ended July 31, 2023 was $38.0 million, or approximately 15.5% of the corresponding consolidated revenues, which reflected positive contributions from all three reportable business segments. For the six-month period ended July 31, 2022, the consolidated gross profit was $44.1 million, which represented approximately 20.2% of the corresponding amount of consolidated revenues.
Selling, general and administrative expenses for the six months ended July 31, 2023 and 2022 were $21.1 million, or 8.6% of corresponding consolidated revenues, and $21.6 million, or 9.9% of corresponding consolidated revenues, respectively.
Other income, net, for the six months ended July 31, 2023 was $3.5 million, which reflected income earned during the period on funds invested in a money market fund, CDs and U.S. Treasury notes, partially offset by the wire-transfer fraud loss that occurred in the first quarter of Fiscal 2024, its partial recovery, and related professional fees (see Note 15 to the accompanying condensed consolidated financial statements). Other income, net, for the six months ended July 31, 2022 was $1.1 million, which included primarily earnings associated with our solar fund investments.
For the six months ended July 31, 2023, income tax expense was $5.5 million which represented an effective income tax rate of 26.9%. For the six months ended July 31, 2022, income tax expense was $12.0 million, which included the unfavorable adjustment amount identified above. Excluding the effect of the adjustment, our effective income tax rate for the six months ended July 31, 2022 was 24.4%.
For the three months ended July 31, 2023, our overall operating profit performance resulted in net income in the amount of $12.8 million, or $0.94 per diluted share. For the comparable period last year, we reported net income in the amount of $4.2 million, or $0.30 per dilutive share. For the six months ended July 31, 2023 and 2022, net income was $14.9 million, or $1.10 per diluted share, and $11.7 million, or $0.80 per diluted share, respectively.
Project Backlog
At July 31, 2023, our consolidated project backlog amount of $0.8 billion consisted substantially of the projects of the power industry services reporting segment. The comparable consolidated backlog amount as of January 31, 2023 was also $0.8 billion. Our reported amount of project backlog at a point in time represents the total value of projects awarded to us that we consider to be firm as of that date less the amounts of revenues recognized to date on the corresponding projects.
Typically, we include the total value of EPC services and other major construction contracts in project backlog when we receive a corresponding notice to proceed from the project owner. However, we may include the value of an EPC services contract prior to the receipt of a notice to proceed if we believe that it is probable that the project will commence within a reasonable timeframe, among other factors. However, cancellations or reductions may occur that would reduce project backlog and that could adversely affect our expected future revenues.
We are committed to the construction of state-of-the-art, natural gas-fired power plants, which represents our core business, as important elements of our country’s electricity-generation mix now and in the future. In addition, we have been directing certain business development efforts to winning projects for the erection of utility-scale wind farms and solar fields and