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| Limitations Beginning October 2002, all Covered Employment and Wages publications are based on the new North American Industry Classification System (NAICS). All previous publications were based on the former Standard Industry Classification (SIC) system. A New Way of Looking at Ohio's Industry: A first look at Establishment and Employment numbers as a result of the North American Industry Classification System, in pdf, discusses the differences in the two classification systems. Due to statutory changes, employment and wage coverage in this report has been extended periodically. Historical data are therefore not always comparable to current data. Because of confidentiality requirements, data are not disclosed for any industry level within an ownership class consisting of fewer than three reporting units or where any one employer has 80% or more of the industry's total employment. Because of industry code changes between years, there may be substantial employment and wage shifts among industries. Preliminary data are not available until five to six months after the end of the reference quarter. Annual data are not available until the fall of the following year. |