Industrial Production Explanatory Notes Coverage. Market groups consist of products and materials.
Materials are inputs in the manufacture of products.
Special aggregates, that highlight the relative importance and contributions of several key industries, such as high-technology and motor vehicles, are summarized in table 2 and table 5. For a detailed description of the contents of the statistical tables, see below. When suitable data on physical product are not available, estimates of output are based on either production-worker hours or electric power use by industry. Data on hours worked by production workers are collected in the monthly establishment survey conducted by the Bureau of Labor Statistics. The data on electric power use are described in explanatory notes for electric power .