Consolidated gross profit for the three-month period ended October 31, 2022 was $22.2 million, or approximately 18.8% of the corresponding consolidated revenues, which reflected favorable contributions from all three reportable business segments. For the three-month period ended October 31, 2021, the consolidated gross profit was $26.1 million, which represented approximately 21.0% of the corresponding amount of consolidated revenues.
Selling, general and administrative expenses for the three months ended October 31, 2022 and 2021 were $12.7 million and $11.6 million, respectively.
Consolidated revenues for the nine months ended October 31, 2022 were $336.3 million, which represented a decrease of $47.5 million, or 12.4%, from consolidated revenues of $383.8 million reported for the nine months ended October 31, 2021.
The revenues of power industry services decreased by $39.8 million to $256.0 million for the nine months ended October 31, 2022, from $295.7 million reported for the nine months ended October 31, 2021. The revenues of this reportable segment of our business represented 76.1% and 77.1% of corresponding consolidated revenues for the nine months ended October 31, 2022 and 2021, respectively. The industrial services business reported revenues of $67.7 million for the nine months ended October 31, 2022. This amount represented a decrease of $10.6 million, or 13.5%, from revenues of $78.2 million reported by TRC for the nine months ended October 31, 2021. Revenues provided by this reportable business segment represented 20.1% and 20.4% of corresponding consolidated revenues for the nine months ended October 31, 2022 and 2021, respectively.
Consolidated gross profit for the nine-month period ended October 31, 2022 was $66.3 million, or 19.7% of the corresponding consolidated revenues, which also reflected favorable contributions from all three reportable business segments. For the nine-month period ended October 31, 2021, the consolidated gross profit was $77.5 million, which represented approximately 20.2% of the corresponding amount of consolidated revenues.
Selling, general and administrative expenses for the nine months ended October 31, 2022 and 2021 were $34.2 million and $31.8 million, respectively.
For the three months ended October 31, 2022, income tax expense was $2.6 million which represented an effective income tax rate of 24.7% for the period. For the three months ended October 31, 2021, income tax expense was $3.3 million which represented an effective income tax rate of 20.9% for the period.
Due substantially to the unfavorable income tax expense adjustment recorded during the nine months ended October 31, 2022 in the approximate amount of $6.2 million and related to the settlement of claims with the IRS as discussed in Note 10 to our condensed consolidated financial statements, income tax expense increased to $14.5 million for the period from $11.2 million for the nine months ended October 31, 2021. Excluding the effect of the IRS settlement adjustment, our effective income tax rate for the nine months ended October 31, 2022 was 24.5%. For the nine months ended October 31, 2021, our effective income tax rate was 23.8%.
For the three months ended October 31, 2022, our overall operating profit performance resulted in net income in the amount of $7.8 million, or $0.56 per diluted share. For the comparable period last year, we reported net income in the amount of $12.4 million, or $0.78 per dilutive share. For the nine months ended October 31, 2022 and 2021, net income was $19.5 million, or $1.36 per diluted share, and $36.0 million, or $2.25 per diluted share, respectively. The unfavorable income tax expense adjustment identified above reduced net income per diluted share for the nine months ended October 31, 2022 by $0.43.
Project Backlog
At October 31, 2022, our consolidated project backlog amount of $0.8 billion substantially consisted of the projects of the power industry services reporting segment. The comparable backlog amount as of January 31, 2022 was $0.7 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