Aetna 2012 Annual Report Download - page 142

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Report of Independent Registered Public Accounting Firm
The Board of Directors and Shareholders
Aetna Inc.:
We have audited the accompanying consolidated balance sheets of Aetna Inc. and subsidiaries
(the “Company”) as of December 31, 2012 and 2011, and the related consolidated statements of
income, comprehensive income, shareholders’ equity and cash flows for each of the years in the
three-year period ended December 31, 2012. We also have audited the Company’ s internal
control over financial reporting as of December 31, 2012, based on criteria established in
Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations
of the Treadway Commission (COSO). The Company’ s management is responsible for these
consolidated financial statements, for maintaining effective internal control over financial
reporting, and for its assessment of the effectiveness of internal control over financial reporting,
included in the accompanying Management’ s Report on Internal Control Over Financial
Reporting. Our responsibility is to express an opinion on these consolidated financial statements
and an opinion on the Company’ s internal control over financial reporting based on our audits.
We conducted our audits in accordance with the standards of the Public Company Accounting
Oversight Board (United States). Those standards require that we plan and perform the audits to
obtain reasonable assurance about whether the financial statements are free of material
misstatement and whether effective internal control over financial reporting was maintained in
all material respects. Our audits of the consolidated financial statements included examining, on
a test basis, evidence supporting the amounts and disclosures in the financial statements,
assessing the accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. Our audit of internal control over
financial reporting included obtaining an understanding of internal control over financial
reporting, assessing the risk that a material weakness exists, and testing and evaluating the
design and operating effectiveness of internal control based on the assessed risk. Our audits also
included performing such other procedures as we considered necessary in the circumstances. We
believe that our audits provide a reasonable basis for our opinions.
A company’ s internal control over financial reporting is a process designed to provide
reasonable assurance regarding the reliability of financial reporting and the preparation of
financial statements for external purposes in accordance with generally accepted accounting
principles. A company’ s internal control over financial reporting includes those policies and
procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately
and fairly reflect the transactions and dispositions of the assets of the company; (2) provide
reasonable assurance that transactions are recorded as necessary to permit preparation of
KPMG LLP
One Financial Plaza
755 Main Street
Hartford, CT 06103
KPMG LLP is a Delaware limited liability partnership,
the U.S. member firm of KPMG International Cooperative
(“KPMG International”), a Swiss entity.
Annual Report - Page 136