Bridge Between NAICS and SIC Structure of Table 1

In Table 1, lines showing an NAICS code refer to that industry as a whole. Lines showing a SIC refer to that part of the SIC that is classified in this NAICS. If there is no code in the "Pt" column, then the entirety of the SIC falls within this NAICS. If a Pt code is shown, then a figure is shown to the left of the SIC that indicates what fraction of the total SIC sales, receipts or value of shipments (as derived from Table 2) is classified in this NAICS. Values that round to 100% or 0% occasionally occur, but should not be construed as all or none.

That percentage figure is also a link to the corresponding part of table 2, where you can see the distribution of other parts of this SIC. There are no links for SIC codes entirely within this SIC, since Table 1 would provide no additional information. If you wish to study parts of tables 1 and 2 side by side, you may wish to open Table 2 in a new browser window (right click on the link).

On 6-digit NAICS lines, symbols in the second column define comparability in terms of the relationship between the actual NAICS sales, receipts or value of shipments, and the value that would be obtained by summing all NAICS codes with a value associated with this NAICS greater that 50%. If those two figures are the same, the SIC and NAICS are deemed to be comparable (bridge complete). If the figures are within 3 percent, they are deemed almost comparable (drawbridge slightly open).

Where more than one NAICS part is identified within a single SIC, then a separate summation line is shown.

The symbol is used as a link to the 1992 figures shown in Comparative Statistics. Note that there are links only for SICs, not for NAICS codes.

Bridge symbols shown indicate the comparability of SIC and NAICS categories.

	(Bridge complete.)	Comparable	SIC derivable from NAICS data.
	(Drawbridge slightly open.)	Almost comparable	Sales or receipts from NAICS are within 3% of SIC sales or receipts.
	(Drawbridge open.)	Not comparable	SIC sales or receipts cannot be estimated within 3% from NAICS data.