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. Author manuscript; available in PMC: 2023 Feb 1.
Published in final edited form as: Int J Progn Health Manag. 2021;12(1):10.36001/ijphm.2021.v12i1.2883. doi: 10.36001/ijphm.2021.v12i1.2883

Table 3.

Stratifications

Strata 1 Strata 2 Strata 3
Group 1 Industries: NAICS 321–333, 337 and Establishment size: 1 to 99 employees 1 to 19 employees NAICS 321–332, 337
Group 2 Industries: NAICS 321–333, 337 and Establishment size: 100 or more employees 100 or more employees NAICS 335–336, 339
Group 3 Industries: NAICS 334–336, 339 and Establishment size: 1 to 99 employees 20 to 99 employees NAICS 333–334
Group 4 Industries: NAICS 334–336, 339 and Establishment size: 100 or more employees