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Incidence Rates Table

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Incidence Rate Report for Texas by County

All Races (includes Hispanic), Both Sexes, Melanoma of the Skin, All Ages
Sorted by Rate
County
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Annual Incidence Rate
over rate period
(95% Confidence Interval)

sort sort by rateascending
Average Annual Count
over rate period
sort sort by countdescending
Rate Period
Recent Trend
Recent 5-Year Trend in Incidence Rates
(95% Confidence Interval)
sort sort by trenddescending
Texas 6,10 12.9 (12.7, 13.1) 3,025 2008-2012 falling falling trend -3.7 (-5.6, -1.8)
US (SEER+NPCR) 1,10 19.9 (19.8, 20.0) 65,719 § 2008-2012 stable stable trend 0.1 (-0.9, 1.1)
Runnels County 6,10 30.9 (18.4, 49.0) 4 2008-2012 * *
Hutchinson County 6,10 25.4 (17.2, 36.2) 6 2008-2012 * *
Young County 6,10 25.4 (16.7, 37.2) 6 2008-2012 * *
Sabine County 6,10 25.1 (14.1, 42.1) 4 2008-2012 * *
Randall County 6,10 24.9 (21.1, 29.3) 31 2008-2012 falling falling trend -8.4 (-13.3, -3.2)
Clay County 6,10 23.8 (13.1, 40.3) 3 2008-2012 * *
Fayette County 6,10 23.2 (15.5, 33.5) 7 2008-2012 * *
Scurry County 6,10 22.4 (13.5, 34.8) 4 2008-2012 * *
Parker County 6,10 21.7 (18.1, 25.8) 27 2008-2012 stable stable trend 8.4 (-15.4, 38.9)
Montgomery County 6,10 21.5 (19.5, 23.6) 94 2008-2012 stable stable trend -5.8 (-16.1, 5.7)
Hardin County 6,10 21.4 (16.3, 27.6) 12 2008-2012 * *
Johnson County 6,10 20.7 (17.4, 24.3) 30 2008-2012 stable stable trend -1.2 (-20.3, 22.6)
Hood County 6,10 20.6 (16.0, 26.1) 15 2008-2012 stable stable trend -6.2 (-24.1, 15.8)
Bosque County 6,10 20.1 (13.1, 30.2) 5 2008-2012 * *
Polk County 6,10 19.9 (15.1, 25.8) 13 2008-2012 * *
Lampasas County 6,10 19.9 (12.5, 30.2) 5 2008-2012 * *
Rockwall County 6,10 19.6 (15.3, 24.8) 15 2008-2012 stable stable trend -15.2 (-32.6, 6.8)
Gray County 6,10 19.4 (12.7, 28.4) 5 2008-2012 * *
Wichita County 6,10 19.3 (16.0, 23.0) 26 2008-2012 stable stable trend -14.5 (-32.7, 8.5)
Cooke County 6,10 18.9 (13.4, 26.0) 8 2008-2012 * *
Kendall County 6,10 18.8 (13.2, 26.1) 8 2008-2012 * *
Potter County 6,10 18.7 (15.3, 22.7) 21 2008-2012 stable stable trend -8.4 (-20.5, 5.5)
Burnet County 6,10 18.7 (13.7, 25.0) 10 2008-2012 * *
Washington County 6,10 18.6 (13.3, 25.5) 8 2008-2012 * *
Tom Green County 6,10 18.6 (15.2, 22.5) 22 2008-2012 stable stable trend 0.6 (-11.9, 14.9)
Palo Pinto County 6,10 18.6 (12.2, 27.1) 6 2008-2012 * *
Llano County 6,10 18.5 (11.8, 28.6) 6 2008-2012 * *
Angelina County 6,10 18.4 (14.6, 22.8) 17 2008-2012 stable stable trend -11.1 (-25.0, 5.3)
Eastland County 6,10 18.3 (11.4, 28.3) 5 2008-2012 * *
Jasper County 6,10 18.1 (12.7, 25.1) 8 2008-2012 * *
Erath County 6,10 17.9 (12.2, 25.3) 7 2008-2012 * *
Grayson County 6,10 17.8 (14.8, 21.2) 26 2008-2012 stable stable trend 7.3 (-4.1, 20.0)
Orange County 6,10 17.7 (14.0, 22.2) 16 2008-2012 stable stable trend -6.7 (-18.1, 6.3)
Colorado County 6,10 17.7 (11.1, 27.0) 5 2008-2012 * *
Comal County 6,10 17.6 (14.5, 21.3) 24 2008-2012 stable stable trend -8.9 (-18.4, 1.8)
DeWitt County 6,10 17.6 (10.9, 27.1) 5 2008-2012 * *
Brown County 6,10 17.6 (12.4, 24.2) 8 2008-2012 * *
Gonzales County 6,10 17.3 (10.3, 27.4) 4 2008-2012 * *
Brazos County 6,10 17.2 (14.0, 20.8) 22 2008-2012 stable stable trend -9.6 (-19.1, 0.9)
Milam County 6,10 17.1 (11.1, 25.3) 5 2008-2012 * *
Hays County 6,10 17.0 (13.9, 20.6) 22 2008-2012 falling falling trend -14.5 (-21.9, -6.4)
Montague County 6,10 16.8 (10.0, 26.7) 4 2008-2012 * *
Aransas County 6,10 16.7 (10.1, 26.2) 5 2008-2012 * *
Brazoria County 6,10 16.6 (14.5, 19.0) 47 2008-2012 stable stable trend -2.0 (-15.2, 13.1)
Austin County 6,10 16.5 (10.4, 24.9) 5 2008-2012 * *
Comanche County 6,10 16.4 (9.1, 27.8) 3 2008-2012 * *
Hill County 6,10 16.3 (11.4, 22.8) 7 2008-2012 * *
Kaufman County 6,10 16.3 (12.8, 20.4) 16 2008-2012 stable stable trend 6.3 (-31.4, 64.6)
Bastrop County 6,10 16.3 (12.4, 21.1) 12 2008-2012 * *
San Jacinto County 6,10 16.1 (9.8, 24.9) 5 2008-2012 * *
Wilson County 6,10 16.1 (11.2, 22.4) 7 2008-2012 * *
Bell County 6,10 16.0 (13.9, 18.5) 40 2008-2012 stable stable trend -3.1 (-12.6, 7.4)
Kerr County 6,10 16.0 (12.2, 20.9) 13 2008-2012 * *
McLennan County 6,10 15.9 (13.7, 18.4) 37 2008-2012 stable stable trend -5.2 (-23.1, 16.8)
Galveston County 6,10 15.9 (13.9, 18.1) 47 2008-2012 stable stable trend -2.2 (-10.5, 6.9)
Tarrant County 6,10 15.7 (14.8, 16.6) 250 2008-2012 stable stable trend 5.2 (-0.6, 11.4)
Collin County 6,10 15.6 (14.3, 17.1) 108 2008-2012 stable stable trend 1.5 (-11.8, 16.9)
Gillespie County 6,10 15.6 (10.3, 23.2) 7 2008-2012 * *
Hunt County 6,10 15.2 (11.9, 19.2) 15 2008-2012 falling falling trend -19.6 (-29.6, -8.2)
Coryell County 6,10 15.1 (10.8, 20.5) 9 2008-2012 * *
Guadalupe County 6,10 15.0 (12.1, 18.3) 20 2008-2012 stable stable trend 1.4 (-9.9, 14.2)
Henderson County 6,10 14.9 (11.5, 19.1) 15 2008-2012 stable stable trend 7.0 (-4.1, 19.4)
Shelby County 6,10 14.9 (9.3, 22.8) 4 2008-2012 * *
Williamson County 6,10 14.8 (13.1, 16.7) 56 2008-2012 stable stable trend -10.5 (-22.6, 3.5)
Walker County 6,10 14.8 (10.6, 19.9) 9 2008-2012 * *
Wise County 6,10 14.6 (10.7, 19.7) 9 2008-2012 * *
Denton County 6,10 14.6 (13.1, 16.2) 81 2008-2012 stable stable trend 3.6 (-8.5, 17.3)
Van Zandt County 6,10 14.5 (10.6, 19.5) 10 2008-2012 * *
Wharton County 6,10 14.0 (9.7, 19.8) 7 2008-2012 * *
Nacogdoches County 6,10 14.0 (9.9, 19.1) 8 2008-2012 * *
Chambers County 6,10 13.9 (8.7, 21.1) 5 2008-2012 * *
Limestone County 6,10 13.9 (8.4, 21.9) 4 2008-2012 * *
Houston County 6,10 13.9 (8.3, 22.0) 4 2008-2012 * *
Travis County 6,10 13.9 (12.7, 15.1) 115 2008-2012 falling falling trend -11.8 (-20.8, -1.8)
Ellis County 6,10 13.8 (11.1, 17.0) 19 2008-2012 stable stable trend -15.7 (-30.3, 1.8)
Fort Bend County 6,10 13.6 (12.1, 15.2) 70 2008-2012 stable stable trend -7.5 (-19.1, 5.7)
Navarro County 6,10 13.4 (9.3, 18.8) 7 2008-2012 * *
Tyler County 6,10 13.3 (8.2, 20.9) 4 2008-2012 * *
Trinity County 6,10 13.3 (7.5, 22.9) 3 2008-2012 * *
Jefferson County 6,10 13.3 (11.4, 15.4) 35 2008-2012 stable stable trend -0.5 (-30.0, 41.3)
San Patricio County 6,10 13.2 (9.6, 17.7) 9 2008-2012 * *
Hopkins County 6,10 12.9 (8.4, 19.0) 5 2008-2012 * *
Ector County 6,10 12.9 (10.1, 16.1) 16 2008-2012 falling falling trend -11.9 (-18.2, -5.1)
Lamar County 6,10 12.5 (8.8, 17.3) 8 2008-2012 * *
Lubbock County 6,10 12.5 (10.6, 14.6) 33 2008-2012 stable stable trend 7.8 (-12.5, 32.8)
Harris County 6,10 12.4 (11.9, 13.0) 424 2008-2012 stable stable trend -5.1 (-14.3, 5.2)
Bandera County 6,10 12.4 (7.1, 20.8) 4 2008-2012 * *
Midland County 6,10 12.4 (9.8, 15.4) 17 2008-2012 stable stable trend -0.1 (-19.3, 23.6)
Howard County 6,10 12.4 (7.8, 18.7) 5 2008-2012 * *
Waller County 6,10 12.3 (7.7, 18.7) 5 2008-2012 * *
Taylor County 6,10 12.2 (9.6, 15.2) 16 2008-2012 falling falling trend -11.0 (-16.8, -4.9)
Bowie County 6,10 11.9 (9.1, 15.3) 12 2008-2012 * *
Fannin County 6,10 11.8 (7.6, 17.5) 5 2008-2012 * *
Wood County 6,10 11.4 (7.4, 16.9) 6 2008-2012 * *
Harrison County 6,10 11.3 (7.9, 15.5) 8 2008-2012 * *
Cherokee County 6,10 11.1 (7.5, 16.0) 6 2008-2012 * *
Dallas County 6,10 10.8 (10.2, 11.5) 216 2008-2012 stable stable trend -2.4 (-9.4, 5.1)
Victoria County 6,10 10.7 (7.8, 14.3) 9 2008-2012 * *
Caldwell County 6,10 10.6 (6.5, 16.3) 4 2008-2012 * *
Hale County 6,10 10.5 (6.4, 16.3) 4 2008-2012 * *
Medina County 6,10 10.5 (6.8, 15.4) 5 2008-2012 * *
Grimes County 6,10 10.5 (5.9, 17.4) 3 2008-2012 * *
Matagorda County 6,10 10.3 (6.3, 15.9) 4 2008-2012 * *
Rusk County 6,10 10.3 (6.8, 14.8) 6 2008-2012 * *
Bexar County 6,10 10.0 (9.3, 10.7) 156 2008-2012 falling falling trend -12.6 (-20.6, -3.8)
Anderson County 6,10 9.9 (6.8, 14.1) 7 2008-2012 * *
Liberty County 6,10 9.8 (6.8, 13.7) 7 2008-2012 * *
Atascosa County 6,10 9.5 (5.9, 14.5) 4 2008-2012 * *
Upshur County 6,10 9.3 (5.8, 14.3) 5 2008-2012 * *
Nueces County 6,10 8.8 (7.5, 10.4) 31 2008-2012 stable stable trend 3.8 (-8.4, 17.6)
Cass County 6,10 8.6 (5.1, 13.8) 4 2008-2012 * *
Smith County 6,10 8.4 (6.8, 10.2) 19 2008-2012 stable stable trend 0.5 (-16.9, 21.5)
Val Verde County 6,10 6.7 (3.8, 10.9) 3 2008-2012 * *
Gregg County 6,10 6.4 (4.5, 8.7) 8 2008-2012 * *
Cameron County 6,10 5.9 (4.8, 7.1) 21 2008-2012 stable stable trend -2.2 (-18.2, 16.9)
Hidalgo County 6,10 5.6 (4.7, 6.5) 33 2008-2012 falling falling trend -21.0 (-33.4, -6.3)
El Paso County 6,10 5.2 (4.5, 6.0) 37 2008-2012 stable stable trend -1.6 (-20.3, 21.6)
Webb County 6,10 3.4 (2.3, 4.9) 6 2008-2012 * *
Andrews County 6,10
*
3 or fewer
2008-2012 * *
Archer County 6,10
*
3 or fewer
2008-2012 * *
Armstrong County 6,10
*
3 or fewer
2008-2012 * *
Bailey County 6,10
*
3 or fewer
2008-2012 * *
Baylor County 6,10
*
3 or fewer
2008-2012 * *
Bee County 6,10
*
3 or fewer
2008-2012 * *
Blanco County 6,10
*
3 or fewer
2008-2012 * *
Borden County 6,10
*
3 or fewer
2008-2012 * *
Brewster County 6,10
*
3 or fewer
2008-2012 * *
Briscoe County 6,10
*
3 or fewer
2008-2012 * *
Brooks County 6,10
*
3 or fewer
2008-2012 * *
Burleson County 6,10
*
3 or fewer
2008-2012 * *
Calhoun County 6,10
*
3 or fewer
2008-2012 * *
Callahan County 6,10
*
3 or fewer
2008-2012 * *
Camp County 6,10
*
3 or fewer
2008-2012 * *
Carson County 6,10
*
3 or fewer
2008-2012 * *
Castro County 6,10
*
3 or fewer
2008-2012 * *
Childress County 6,10
*
3 or fewer
2008-2012 * *
Cochran County 6,10
*
3 or fewer
2008-2012 * *
Coke County 6,10
*
3 or fewer
2008-2012 * *
Coleman County 6,10
*
3 or fewer
2008-2012 * *
Collingsworth County 6,10
*
3 or fewer
2008-2012 * *
Concho County 6,10
*
3 or fewer
2008-2012 * *
Cottle County 6,10
*
3 or fewer
2008-2012 * *
Crane County 6,10
*
3 or fewer
2008-2012 * *
Crockett County 6,10
*
3 or fewer
2008-2012 * *
Crosby County 6,10
*
3 or fewer
2008-2012 * *
Culberson County 6,10
*
3 or fewer
2008-2012 * *
Dallam County 6,10
*
3 or fewer
2008-2012 * *
Dawson County 6,10
*
3 or fewer
2008-2012 * *
Deaf Smith County 6,10
*
3 or fewer
2008-2012 * *
Delta County 6,10
*
3 or fewer
2008-2012 * *
Dickens County 6,10
*
3 or fewer
2008-2012 * *
Dimmit County 6,10
*
3 or fewer
2008-2012 * *
Donley County 6,10
*
3 or fewer
2008-2012 * *
Duval County 6,10
*
3 or fewer
2008-2012 * *
Edwards County 6,10
*
3 or fewer
2008-2012 * *
Falls County 6,10
*
3 or fewer
2008-2012 * *
Fisher County 6,10
*
3 or fewer
2008-2012 * *
Floyd County 6,10
*
3 or fewer
2008-2012 * *
Foard County 6,10
*
3 or fewer
2008-2012 * *
Franklin County 6,10
*
3 or fewer
2008-2012 * *
Freestone County 6,10
*
3 or fewer
2008-2012 * *
Frio County 6,10
*
3 or fewer
2008-2012 * *
Gaines County 6,10
*
3 or fewer
2008-2012 * *
Garza County 6,10
*
3 or fewer
2008-2012 * *
Glasscock County 6,10
*
3 or fewer
2008-2012 * *
Goliad County 6,10
*
3 or fewer
2008-2012 * *
Hall County 6,10
*
3 or fewer
2008-2012 * *
Hamilton County 6,10
*
3 or fewer
2008-2012 * *
Hansford County 6,10
*
3 or fewer
2008-2012 * *
Hardeman County 6,10
*
3 or fewer
2008-2012 * *
Hartley County 6,10
*
3 or fewer
2008-2012 * *
Haskell County 6,10
*
3 or fewer
2008-2012 * *
Hemphill County 6,10
*
3 or fewer
2008-2012 * *
Hockley County 6,10
*
3 or fewer
2008-2012 * *
Hudspeth County 6,10
*
3 or fewer
2008-2012 * *
Irion County 6,10
*
3 or fewer
2008-2012 * *
Jack County 6,10
*
3 or fewer
2008-2012 * *
Jackson County 6,10
*
3 or fewer
2008-2012 * *
Jeff Davis County 6,10
*
3 or fewer
2008-2012 * *
Jim Hogg County 6,10
*
3 or fewer
2008-2012 * *
Jim Wells County 6,10
*
3 or fewer
2008-2012 * *
Jones County 6,10
*
3 or fewer
2008-2012 * *
Karnes County 6,10
*
3 or fewer
2008-2012 * *
Kenedy County 6,10
*
3 or fewer
2008-2012 * *
Kent County 6,10
*
3 or fewer
2008-2012 * *
Kimble County 6,10
*
3 or fewer
2008-2012 * *
King County 6,10
*
3 or fewer
2008-2012 * *
Kinney County 6,10
*
3 or fewer
2008-2012 * *
Kleberg County 6,10
*
3 or fewer
2008-2012 * *
Knox County 6,10
*
3 or fewer
2008-2012 * *
La Salle County 6,10
*
3 or fewer
2008-2012 * *
Lamb County 6,10
*
3 or fewer
2008-2012 * *
Lavaca County 6,10
*
3 or fewer
2008-2012 * *
Lee County 6,10
*
3 or fewer
2008-2012 * *
Leon County 6,10
*
3 or fewer
2008-2012 * *
Lipscomb County 6,10
*
3 or fewer
2008-2012 * *
Live Oak County 6,10
*
3 or fewer
2008-2012 * *
Loving County 6,10
*
3 or fewer
2008-2012 * *
Lynn County 6,10
*
3 or fewer
2008-2012 * *
Madison County 6,10
*
3 or fewer
2008-2012 * *
Marion County 6,10
*
3 or fewer
2008-2012 * *
Martin County 6,10
*
3 or fewer
2008-2012 * *
Mason County 6,10
*
3 or fewer
2008-2012 * *
Maverick County 6,10
*
3 or fewer
2008-2012 * *
McCulloch County 6,10
*
3 or fewer
2008-2012 * *
McMullen County 6,10
*
3 or fewer
2008-2012 * *
Menard County 6,10
*
3 or fewer
2008-2012 * *
Mills County 6,10
*
3 or fewer
2008-2012 * *
Mitchell County 6,10
*
3 or fewer
2008-2012 * *
Moore County 6,10
*
3 or fewer
2008-2012 * *
Morris County 6,10
*
3 or fewer
2008-2012 * *
Motley County 6,10
*
3 or fewer
2008-2012 * *
Newton County 6,10
*
3 or fewer
2008-2012 * *
Nolan County 6,10
*
3 or fewer
2008-2012 * *
Ochiltree County 6,10
*
3 or fewer
2008-2012 * *
Oldham County 6,10
*
3 or fewer
2008-2012 * *
Panola County 6,10
*
3 or fewer
2008-2012 * *
Parmer County 6,10
*
3 or fewer
2008-2012 * *
Pecos County 6,10
*
3 or fewer
2008-2012 * *
Presidio County 6,10
*
3 or fewer
2008-2012 * *
Rains County 6,10
*
3 or fewer
2008-2012 * *
Reagan County 6,10
*
3 or fewer
2008-2012 * *
Real County 6,10
*
3 or fewer
2008-2012 * *
Red River County 6,10
*
3 or fewer
2008-2012 * *
Reeves County 6,10
*
3 or fewer
2008-2012 * *
Refugio County 6,10
*
3 or fewer
2008-2012 * *
Roberts County 6,10
*
3 or fewer
2008-2012 * *
Robertson County 6,10
*
3 or fewer
2008-2012 * *
San Augustine County 6,10
*
3 or fewer
2008-2012 * *
San Saba County 6,10
*
3 or fewer
2008-2012 * *
Schleicher County 6,10
*
3 or fewer
2008-2012 * *
Shackelford County 6,10
*
3 or fewer
2008-2012 * *
Sherman County 6,10
*
3 or fewer
2008-2012 * *
Somervell County 6,10
*
3 or fewer
2008-2012 * *
Starr County 6,10
*
3 or fewer
2008-2012 * *
Stephens County 6,10
*
3 or fewer
2008-2012 * *
Sterling County 6,10
*
3 or fewer
2008-2012 * *
Stonewall County 6,10
*
3 or fewer
2008-2012 * *
Sutton County 6,10
*
3 or fewer
2008-2012 * *
Swisher County 6,10
*
3 or fewer
2008-2012 * *
Terrell County 6,10
*
3 or fewer
2008-2012 * *
Terry County 6,10
*
3 or fewer
2008-2012 * *
Throckmorton County 6,10
*
3 or fewer
2008-2012 * *
Titus County 6,10
*
3 or fewer
2008-2012 * *
Upton County 6,10
*
3 or fewer
2008-2012 * *
Uvalde County 6,10
*
3 or fewer
2008-2012 * *
Ward County 6,10
*
3 or fewer
2008-2012 * *
Wheeler County 6,10
*
3 or fewer
2008-2012 * *
Wilbarger County 6,10
*
3 or fewer
2008-2012 * *
Willacy County 6,10
*
3 or fewer
2008-2012 * *
Winkler County 6,10
*
3 or fewer
2008-2012 * *
Yoakum County 6,10
*
3 or fewer
2008-2012 * *
Zapata County 6,10
*
3 or fewer
2008-2012 * *
Zavala County 6,10
*
3 or fewer
2008-2012 * *
Notes:
Created by statecancerprofiles.cancer.gov on 08/01/2015 6:13 pm.
Data for the United States does not include data from Nevada.
State Cancer Registries may provide more current or more local data.
† Incidence rates (cases per 100,000 population per year) are age-adjusted to the 2000 US standard population (19 age groups: <1, 1-4, 5-9, ... , 80-84, 85+). Rates are for invasive cancer only (except for bladder cancer which is invasive and in situ) or unless otherwise specified. Rates calculated using SEER*Stat. Population counts for denominators are based on Census populations as modified by NCI. The 1969-2013 US Population Data File is used for SEER and NPCR incidence rates.
‡ Incidence data come from different sources. Due to different years of data availability, most of the trends are AAPCs based on APCs but some are APCs calculated in SEER*Stat. Please refer to the source for each area for additional information.
§ The total count for the US (SEER+NPCR) may differ from the summation of the individual states reported in this table. The total uses data from the CDC's National Program of Cancer Registries Cancer Surveillance System (NPCR-CSS) January 2015 data submission for the following states: California, Kentucky, Louisiana, and New Jersey but data for those states when shown individually are sourced from the SEER November 2014 submission.
* Data has been suppressed to ensure confidentiality and stability of rate estimates. Counts are suppressed if fewer than 16 cases were reported in a specific area-sex-race category.

1 Source: CDC's National Program of Cancer Registries Cancer Surveillance System (NPCR-CSS) November 2014 data submission and SEER November 2014 submission.
6 Source: State Cancer Registry and the CDC's National Program of Cancer Registries Cancer Surveillance System (NPCR-CSS) November 2014 data submission. State rates include rates from metropolitan areas funded by SEER.
10 Source: Incidence data provided by the National Program of Cancer Registries (NPCR). EAPCs calculated by the National Cancer Institute using SEER*Stat. Rates are age-adjusted to the 2000 US standard population (19 age groups: <1, 1-4, 5-9, ... , 80-84,85+). Rates are for invasive cancer only (except for bladder cancer which is invasive and in situ) or unless otherwise specified. Population counts for denominators are based on Census populations as modified by NCI. The 1969-2013 US Population Data File is used with NPCR November 2014 data.

Please note that the data comes from different sources. Due to different years of data availablility, most of the trends are AAPCs based on APCs but some are APCs calculated in SEER*Stat. Please refer to the source for each graph for additional information.

Interpret Rankings provides insight into interpreting cancer incidence statistics. When the population size for a denominator is small, the rates may be unstable. A rate is unstable when a small change in the numerator (e.g., only one or two additional cases) has a dramatic effect on the calculated rate.

Suppression is used to avoid misinterpretation when rates are unstable.

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