Industrial output in April dropped 1.6 percent, forcing a downward revision of 0.5 percentage point from a preliminary report, the Ministry of International Trade and Industry said in a report released Monday.

The production index for the nation's mines and factories came to a seasonally adjusted 98.3, taking 1995 as a base year of 100, marking the third straight monthly decline. The downward revision is attributed to revised data for rolling stock, as well as weak production of steering and other auto parts not reflected in the preliminary report.

For the other indexes, the shipments index dropped 2.9 percent to 98.3 for the reporting month compared to a preliminary decrease of 2.8 percent, according to the report.

The inventories index edged up 0.1 percent to 108.5, compared with a 0.5 percent preliminary increase.