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f. Apply a marginal threshold of 1 - 10 and cell threshold of 1 - 10 to all tabulations <br />g. (0 < n < 11 suppressed). <br />h. To protect against secondary disclosure, suppress additional cells to ensure the primary suppressed <br />small value cannot be recalculated. <br />i. Suppression of percentages that can be used to recalculate a small number is also required. <br />j. Use aggregation to prevent small numbers but allow reporting of data. Age ranges are a very good <br />example of where aggregation can be used to avoid small numbers but avoid suppressing data (see <br />example below). <br />7. Small Numbers Examples <br />a. Example (Before Applying Standard) <br />Client Gender <br />County <br />Accountable Community of Health (ACH) <br />Statewide <br />Male <br />6 <br />8 <br />14 <br />Female <br />11 <br />15 <br />26 <br />TOTAL <br />17 <br />23 <br />40 <br />b. Example (After Applying Standard) <br />Client Gender County ach <br />Statewide <br />Male --- --- <br />14 <br />Female 11 15 <br />26 <br />TOTAL --- --- <br />40 <br />In order to protect the privacy of individuals, cells in this data product that contain small numbers from 1 <br />to 10 are not displayed. <br />The above examples show in order to comply with the standard, analysts must not only suppress directly <br />those cells where n < 11, but also in this case secondary suppression is necessary of the county and ACI <br />totals in order to avoid calculation of those cells that contained small numbers. <br />c. Example (Suppression with no aggregation) <br />Age Range <br />County <br />ach <br />Statewide <br />0-3 <br />5 (would be suppressed) <br />8 (would be suppressed) <br />13 (would be <br />suppressed) <br />4-6 <br />7 (would be suppressed) <br />18 <br />25 (would be <br />suppressed) <br />15 <br />23 <br />38 <br />10-12 <br />24 <br />33 <br />57 <br />TOTAL <br />51 (would be suppressed) <br />82 (would be suppressed) <br />133 <br />d. Example (Using aggregation instead of suppression) <br />Age Range <br />County <br />ach <br />Statewide <br />0-6 <br />12 <br />26 <br />38 <br />7-9 <br />15 <br />23 <br />38 <br />Washington State <br />Health Care Authority Page 23 HCA Contract No. K5885-1 <br />