z i m m e r h o l d i n g s , i n c . a n d s u b s i d i a r i e s 2 0 0 3 f o r m 1 0 - k contractual obligations the company has entered into contracts with various third parties in the normal course of business which will require future payments . the following table illustrates the company 2019s contractual obligations : than 1 - 3 4 - 5 after contractual obligations total 1 year years years 5 years .
what percent of total contractual obligations is comprised of operating leases?
critical accounting estimates the financial results of the company are affected by the income taxes 2013 the company estimates income selection and application of accounting policies and methods . tax expense and income tax liabilities and assets by taxable significant accounting policies which require management 2019s jurisdiction . realization of deferred tax assets in each taxable judgment are discussed below . jurisdiction is dependent on the company 2019s ability to generate future taxable income sufficient to realize the excess inventory and instruments 2013 the company benefits . the company evaluates deferred tax assets on must determine as of each balance sheet date how much , if an ongoing basis and provides valuation allowances if it is any , of its inventory may ultimately prove to be unsaleable or determined to be 2018 2018more likely than not 2019 2019 that the deferred unsaleable at its carrying cost . similarly , the company must tax benefit will not be realized . federal income taxes are also determine if instruments on hand will be put to provided on the portion of the income of foreign subsidiaries productive use or remain undeployed as a result of excess that is expected to be remitted to the u.s . the company supply . reserves are established to effectively adjust operates within numerous taxing jurisdictions . the company inventory and instruments to net realizable value . to is subject to regulatory review or audit in virtually all of determine the appropriate level of reserves , the company those jurisdictions and those reviews and audits may require evaluates current stock levels in relation to historical and extended periods of time to resolve . the company makes use expected patterns of demand for all of its products and of all available information and makes reasoned judgments instrument systems and components . the basis for the regarding matters requiring interpretation in establishing determination is generally the same for all inventory and tax expense , liabilities and reserves . the company believes instrument items and categories except for work-in-progress adequate provisions exist for income taxes for all periods inventory , which is recorded at cost . obsolete or and jurisdictions subject to review or audit . discontinued items are generally destroyed and completely written off . management evaluates the need for changes to commitments and contingencies 2013 accruals for valuation reserves based on market conditions , competitive product liability and other claims are established with offerings and other factors on a regular basis . centerpulse internal and external counsel based on current information historically applied a similar conceptual framework in and historical settlement information for claims , related fees estimating market value of excess inventory and instruments and for claims incurred but not reported . an actuarial model under international financial reporting standards and is used by the company to assist management in determining u.s . generally accepted accounting principles . within that an appropriate level of accruals for product liability claims . framework , zimmer and centerpulse differed however , in historical patterns of claim loss development over time are certain respects , to their approaches to such estimation . statistically analyzed to arrive at factors which are then following the acquisition , the company determined that a applied to loss estimates in the actuarial model . the amounts consistent approach is necessary to maintaining effective established represent management 2019s best estimate of the control over financial reporting . consideration was given to ultimate costs that it will incur under the various both approaches and the company established a common contingencies . estimation technique taking both prior approaches into account . this change in estimate resulted in a charge to earnings of $ 3.0 million after tax in the fourth quarter . such change is not considered material to the company 2019s financial position , results of operations or cash flows. .