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. 2009 Aug 26;4(8):e6765. doi: 10.1371/journal.pone.0006765

Table 2. The seven business groups and their North American Industry Classification System (NAICS) codes used in this paper.

Group NAICS code Description
1 11,21,22,23,31,32,33 Mining, utilities, construction, manufacturing, agriculture, forestry, fishing, and hunting
2 42,44,45 Wholesale and retail
3 51,52,53 Information, finance, insurance, and real estate
4 61,62,92 Educational, health care, social assistance, and public administration
5 71,72 Arts, entertainment, recreation, accommodation, and food services
6 48,49,55,56,81 Management of companies, waste management, transportation, warehousing, and other services
7 54 Professional, scientific, and technical services