In the version of the Altman Z-Score Model for non-manufacturing companies:
T1 = Working Capital / Total Assets T2 = Retained Earnings / Total Assets T3 = Earnings Before Interest and Taxes / Total Assets T4 = Market Value of Equity / Total Liabilities
Of those four ratios, note that "Total Assets" is in the denominator of three of the four.
In light of your new-found interest in the Altman Z-Score model, you may be interested in reading this paper written in 2000 by Altman himself: http://pages.stern.nyu.edu/~ealtman/Zscores.pdf
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