The government on Wednesday revised upward slightly a key gauge for the state of the economy for December while leaving its basic economic assessment unchanged from "worsening" in its preliminary report.

The Cabinet Office said the composite index of coincident economic indicators stood at 92.4 against 100 for the base year of 2005, up from a preliminary reading of 92.3 released Feb. 6.

The revised reading represents a drop of 2.5 points from November. The CI consists of various indicators, including industrial production, large-lot electricity use, overtime hours at manufacturers, wholesale and retail sales, and the ratio of job offers to job seekers.

The upward revision came as the index for investment goods and wholesale data for the month were raised from preliminary readings.