TECHNICAL REPORT Kthleen T. Willims, PhD, NCSP Overview... 1 Revisions in the New Edition... 1 Content Coverge... 2 Scores Reported... 2 Stndrdiztion of EVT 2... 2 Evidence Bsed on Relibility... 8 Stndrd Error of Mesurement... 8 Evidence Bsed on Vlidity... 11 Summry... 12 Overview The Expressive Vocbulry Test, Second Edition (EVT 2) is n individully dministered, norm-referenced instrument tht ssesses expressive vocbulry nd word retrievl skills for individuls ge 2 yers 6 months through 90 yers nd older. EVT 2, revision of EVT, is vilble in two prllel forms. Ech form contins exmple items nd 190 test items. For ech item, the exminer presents picture nd reds stimulus question, nd the exminee responds with one word tht provides nd cceptble lbel, nswers specific question, or provides synonym for word tht fits the picture. EVT 2 my be dministered by individuls with rnge of eductionl bckgrounds, including speech-lnguge pthologists, school psychologists, lerning disbilities specilists, nd eductionl dignosticins, who re trined in stndrdized test dministrtion. Professionls cn use EVT 2 s prt of lrger ssessment bttery or simply s brod indictor of orl vocbulry. Revisions in the New Edition The gol for the EVT revision (i.e., EVT 2) ws to mke only those chnges tht would improve the ssessment process while preserving the nture of the instrument. Bsed on tht gol, EVT 2 includes the following content nd design chnges from EVT. A second, prllel testing form ws creted with entirely new content. More words were included tht represent vocbulry tht is lerned in the home environment nd tht is useful for everydy living skills. Criticl erly litercy vocbulry words were dded, such s words tht re frequently used in giving instructions in preschool, kindergrten, nd first-grde clssrooms. Lbeling items hve been included throughout the test, not just t the younger ges. This mkes for smoother trnsition into the synonym tsk for younger exminees nd provides broder smpling of vocbulry types for older exminees. The stimulus question for ech item hs been printed on the record form to fcilitte dministrtion. Items tht re outdted nd hve become less representtive of stndrd Americn English vocbulry hve been dropped from the test.
Content Coverge EVT 2 test content covers brod rnge of expressive vocbulry levels, rnging from preschool through dulthood. The test items brodly smple words tht represent 20 content res (e.g., ctions, vegetbles, tools), prts of speech (nouns, verbs, ttributes), home nd school vocbulry, nd vocbulry s clssified by n dpttion of Beck, McKeown, nd Kucn s (2002) three-tier vocbulry model cross ll levels of difficulty. Scores Reported EVT 2 results cn be reported s ge-bsed or grde-bsed stndrd scores (with men of 100 nd stndrd devition of 15) tht rnge from 20 to 160. In ddition to stndrd scores, percentiles, norml curve equivlents (NCEs), stnines, ge nd grde equivlents, nd growth scle vlue scores re vilble for reporting EVT 2 results. Note: EVT 2 cn be scored by hnd or by computer entry, using Person s Q-globl online scoring nd reporting system. Computer entry my be completed by entering individul item responses or by entering the rw score only. Stndrdiztion of EVT 2 Stndrdiztion testing begn in the fll of 2005 nd ended in the spring of 2006. Dt were collected from smple of 3540 exminees ges 2 yers 6 months to 90 yers nd older by 450 exminers from 320 test sites. The EVT 2 normtive smple is representtive of the English speking U.S. popultion of individuls ges 2 yers 6 months to 81 yers nd older (U.S. Census, 2004). The smple ws strtified for rce/ethnicity, self or primry cregiver eduction level, nd geogrphic region. Tbles 5.6 5.9 nd Figure 5.1 present demogrphic informtion for the EVT 2 stndrdiztion smple. 2
Tble 5.6 Representtion of the EVT -2 Age Norm Smple, by Sex nd Age Femle Mle Totl Age N % Trget % N % Trget % N % 2:6 2:11 50 50 50 50 50 50 100 100 3:0 3:5 50 50 50 50 50 50 100 100 3:6 3:11 50 50 50 50 50 50 100 100 4:0 4:5 50 50 50 50 50 50 100 100 4:6 4:11 50 50 50 50 50 50 100 100 5:0 5:5 55 50 50 55 50 50 110 100 5:6 5:11 55 50 50 55 50 50 110 100 6:0 6:5 64 51 50 61 49 50 125 100 6:6 6:11 62 50 50 63 50 50 125 100 7 100 50 50 100 50 50 200 100 8 100 50 50 100 50 50 200 100 9 102 51 50 98 49 50 200 100 10 76 51 50 74 49 50 150 100 11 62 50 50 63 50 50 125 100 12 63 50 50 62 50 50 125 100 13 64 51 50 61 49 50 125 100 14 63 50 50 62 50 50 125 100 15 16 99 50 50 101 51 50 200 100 17 18 98 49 50 102 51 50 200 100 19 21 75 50 50 75 50 50 150 100 22 24 51 51 50 49 49 50 100 100 25 30 50 50 50 50 50 50 100 100 31 40 50 50 50 50 50 50 100 100 41 50 50 50 50 50 50 50 100 100 51 60 63 50 50 62 50 50 125 100 61 70 66 53 53 59 47 47 125 100 71 80 35 58 59 25 42 42 60 100 81+ 40 67 67 20 33 33 60 100 Totl 1,793 1,747 3,540 Note. At ges 2:6 through 60, trget of 50% femle nd 50% mle ws used. At ges 61+, trget percentges re bsed on the U.S. popultion, using dt from Current Popultion Survey, Mrch 2004 (Bureu of the Census, 2004). Row percentges my not sum to 100% due to rounding. 3
Tble 5.7 Representtion of the EVT -2 Age Norm Smple, by Rce/Ethnicity nd Age Rce/Ethnicity Africn Americn Hispnic White Other Totl Age N % N % N % N % N % b 2:6 2:11 17 17 20 20 60 60 3 3 100 100 3:0 3:5 16 16 19 19 59 59 6 6 100 100 3:6 3:11 17 17 20 20 60 60 3 3 100 100 4:0 4:5 14 14 20 20 61 61 5 5 100 100 4:6 4:11 17 17 18 18 60 60 5 5 100 100 5:0 5:5 18 16 19 17 66 60 7 6 110 100 5:6 5:11 18 16 19 17 67 61 6 5 110 100 Totl, 2 5 117 16.3 135 18.8 433 60.1 35 4.9 720 100 U.S. Pop., 2 5 16.6 18.2 59.0 6.3 100 6:0 6:5 19 15 20 16 79 63 7 6 125 100 6:6 6:11 21 17 20 16 76 61 8 6 125 100 7 29 15 33 17 124 62 14 7 200 100 8 31 16 34 17 122 61 13 7 200 100 9 34 17 34 17 121 61 11 6 200 100 Totl, 6 9 134 15.8 141 16.6 522 61.4 53 6.2 850 100 U.S. Pop., 6 9 16.0 17.4 60.2 6.3 100 10 25 17 23 15 93 62 9 6 150 100 11 20 16 20 16 76 61 9 7 125 100 12 21 17 20 16 75 60 9 7 125 100 13 23 18 21 17 76 61 5 4 125 100 Totl, 10 13 89 17.0 84 16.0 320 61.0 32 6.1 525 100 U.S. Pop., 10 13 17.2 15.9 61.1 5.7 100 14 19 15 20 16 79 63 7 6 125 100 15 16 29 15 26 13 130 65 15 8 200 100 17 18 31 16 27 14 129 65 13 7 200 100 19 21 20 13 25 17 95 63 10 7 150 100 22 24 14 14 17 17 62 62 7 7 100 100 Totl, 14 24 113 14.6 115 14.8 495 63.9 52 6.7 775 100 U.S. Pop., 14 24 15.9 15.9 61.6 6.6 100 25 30 14 14 18 18 61 61 7 7 100 100 31 40 11 11 18 18 63 63 8 8 100 100 Totl, 25 40 25 12.5 36 18.0 124 62.0 15 7.5 200 100 U.S. Pop., 25 40 13.8 16.7 61.5 8.0 100 41 50 11 11 10 10 72 72 7 7 100 100 51 60 18 14 13 10 86 69 8 6 125 100 Totl, 41 60 29 12.9 23 10.2 158 70.2 15 6.7 225 100 U.S. Pop., 41 60 13.1 9.8 70.8 6.3 100 61 70 18 14.4 6 4.8 96 76.8 5 4.0 125 100 U.S. Pop., 61 70 12.6 7.8 73.4 6.3 100 71 80 7 11.7 3 5.0 47 78.3 3 5.0 60 100 U.S. Pop., 71 80 10.9 6.3 77.9 4.9 100 81+ 4 6.7 3 5.0 49 81.7 4 6.7 60 100 U.S. Pop., 81+ 9.5 5.6 80.5 4.4 100 Totl, ll ges 536 15.1 546 15.4 2,244 63.4 214 6.1 3,540 100 U.S. Pop. c, ll ges 15.7 15.8 62.3 6.3 100 Note. U.S. popultion dt from Current Popultion Survey, Mrch 2004 (Bureu of the Census, 2004). Includes Americn Indins, Alsk Ntives, Asin Americns, Pcific Islnders, nd ll other groups not clssified s Africn Americn, Hispnic, or White. b Row percentges my not sum to 100% due to rounding. c Weighted to mtch norm smple ge distribution. 4
Tble 5.8 Representtion of the EVT -2 Age Norm Smple, by Eduction Level nd Age Grde 11 or Less Prent or Exminee Eduction Level Grde 12 or GED 1 3 Yers of College 4+ Yers of College Totl Age N % N % N % N % N % b 2:6 2:11 15 15 26 26 27 27 32 32 100 100 3:0 3:5 15 15 25 25 31 31 29 29 100 100 3:6 3:11 11 11 30 30 31 31 28 28 100 100 4:0 4:5 10 10 27 27 29 29 34 34 100 100 4:6 4:11 10 10 28 28 32 32 30 30 100 100 5:0 5:5 14 13 29 26 33 30 34 31 110 100 5:6 5:11 14 13 28 25 37 34 31 28 110 100 Totl, 2 5 89 12.4 193 26.8 220 30.6 218 30.3 720 100 U.S. Pop., 2 5 11.7 25.9 32.2 30.2 100 6:0 6:5 14 11 35 28 41 33 35 28 125 100 6:6 6:11 10 8 36 29 42 34 37 30 125 100 7 21 11 54 27 67 34 58 29 200 100 8 23 12 49 25 68 34 60 30 200 100 9 20 10 55 28 67 34 58 29 200 100 Totl, 6 9 88 10.4 229 26.9 285 33.5 248 29.2 850 100 U.S. Pop., 6 9 10.7 26.0 33.7 29.5 100 10 16 11 40 27 51 34 43 29 150 100 11 17 14 33 26 41 33 34 27 125 100 12 13 10 38 30 44 35 30 24 125 100 13 17 14 34 27 42 34 32 26 125 100 Totl, 10 13 63 12.0 145 27.6 178 33.9 139 26.5 525 100 U.S. Pop., 10 13 10.5 26.8 34.6 28.1 100 14 9 7 35 28 43 34 38 30 125 100 15 16 21 11 59 30 65 33 55 28 200 100 17 18 23 12 51 26 67 34 59 30 200 100 19 21 16 11 39 26 51 34 44 29 150 100 22 24 8 8 30 30 35 35 27 27 100 100 Totl, 14 24 77 9.9 214 27.6 261 33.7 223 28.8 775 100 U.S. Pop., 14 24 10.0 27.7 33.9 28.3 100 25 30 10 10 30 30 29 29 31 31 100 100 31 40 9 9 30 30 29 29 32 32 100 100 Totl, 25 40 19 9.5 60 30.0 58 29.0 63 31.5 200 100 U.S. Pop., 25 40 12.1 29.9 27.8 30.1 100 41 50 9 9 31 31 31 31 29 29 100 100 51 60 15 12 38 30 34 27 38 30 125 100 Totl, 41 60 24 10.7 69 30.7 65 28.9 67 29.8 225 100 U.S. Pop., 41 60 11.3 31.3 27.2 30.2 100 61 70 29 23.2 41 32.8 27 21.6 28 22.4 125 100 U.S. Pop., 61 70 20.2 36.2 21.1 22.5 100 71 80 16 26.7 21 35.0 12 20.0 11 18.3 60 100 U.S. Pop., 71 80 29.0 35.5 17.8 17.7 100 81+ 24 40.0 17 28.3 9 15.0 10 16.7 60 100 U.S. Pop., 81+ 39.9 32.7 13.3 14.0 100 Totl, ll ges 429 12.1 989 27.9 1,115 31.5 1,007 28.4 3,540 100 U.S. Pop. c, ll ges 12.0 27.7 31.8 28.5 100 Note. U.S. popultion dt from Current Popultion Survey, Mrch 2004 (Bureu of the Census, 2004). Exminee s eduction level ws used for ges 25 nd bove. b Row percentges my not sum to 100% due to rounding. c Weighted to mtch norm smple ge distribution. 5
Tble 5.9 Representtion of the EVT -2 Age Norm Smple, by Geogrphic Region nd Age Geogrphic Region Northest North Centrl South West Totl Age N % N % N % N % N % 2:6 2:11 16 16 19 19 43 43 22 22 100 100 3:0 3:5 14 14 24 24 34 34 28 28 100 100 3:6 3:11 17 17 23 23 40 40 20 20 100 100 4:0 4:5 16 16 24 24 39 39 21 21 100 100 4:6 4:11 16 16 24 24 39 39 21 21 100 100 5:0 5:5 20 18 26 24 48 44 16 15 110 100 5:6 5:11 19 17 26 24 36 33 29 26 110 100 Totl, 2 5 118 16.4 166 23.1 279 38.8 157 21.8 720 100 U.S. Pop., 2 5 16.5 22.6 37.3 23.6 100 6:0 6:5 21 17 30 24 49 39 25 20 125 100 6:6 6:11 16 13 28 22 49 39 32 26 125 100 7 40 20 47 24 75 38 38 19 200 100 8 38 19 44 22 73 37 45 23 200 100 9 36 18 49 25 72 36 43 22 200 100 Totl, 6 9 151 17.8 198 23.3 318 37.4 183 21.5 850 100 U.S. Pop., 6 9 18.1 22.9 35.5 23.5 100 10 27 18 39 26 54 36 30 20 150 100 11 19 15 33 26 43 34 30 24 125 100 12 29 23 28 22 43 34 25 20 125 100 13 26 21 28 22 34 27 37 30 125 100 Totl, 10 13 101 19.2 128 24.4 174 33.1 122 23.2 525 100 U.S. Pop., 10 13 18.4 22.6 35.2 23.9 100 14 24 19 26 21 50 40 25 20 125 100 15 16 33 17 39 20 81 41 47 24 200 100 17 18 31 16 43 22 91 46 35 18 200 100 19 21 31 21 36 24 55 37 28 19 150 100 22 24 16 16 25 25 42 42 17 17 100 100 Totl, 14 24 135 17.4 169 21.8 319 41.2 152 19.6 775 100 U.S. Pop., 14 24 17.9 22.6 36.1 23.4 100 25 30 17 17 23 23 35 35 25 25 100 100 31 40 18 18 22 22 36 36 24 24 100 100 Totl, 25 40 35 17.5 45 22.5 71 35.5 49 24.5 200 100 U.S. Pop., 25 40 18.3 22.4 35.8 23.5 100 41 50 20 20 23 23 36 36 21 21 100 100 51 60 18 14 33 26 49 39 25 20 125 100 Totl, 41 60 38 16.9 56 24.9 85 37.8 46 20.4 225 100 U.S. Pop., 41 60 19.4 22.5 35.6 22.5 100 61 70 21 17 28 22 57 46 19 15 125 100 71 80 10 17 14 23 23 38 13 22 60 100 81+ 12 20 15 25 20 33 13 22 60 100 Totl, 61+ 43 17.6 57 23.3 100 40.8 45 18.4 245 100 U.S. Pop., 61+ 20.1 21.8 36.9 21.2 100 Totl, ll ges 621 17.5 819 23.1 1,346 38.0 754 21.3 3,540 100 U.S. Pop. b, ll ges 18.0 22.6 36.1 23.3 100 Note. U.S. popultion dt from Current Popultion Survey, Mrch 2004 (Bureu of the Census, 2004). Row percentges my not sum to 100% due to rounding. b Weighted to mtch norm smple ge distribution. 6
Figure 5.1 Communities prticipting in the ntionl stndrdiztion progrm West (21.3%) North Centrl (23.1%) South (38.0%) Northest (17.6%) 7
Evidence Bsed on Relibility Relibility refers to the consistency of scores tht would theoreticlly be obtined if the sme exminee were repetedly tested on the sme test under identicl conditions. Although this could never be done, vrious estimtes of relibility re obtined in prctice. The relibility of EVT 2 ws estimted using internl consistency (dt tht show test items within test re homogenous nd yield consistent estimtes of bility), lternte form relibility (dt tht show test forms, i.e., Form A nd Form B, re homogenous nd yield consistent estimtes of bility), nd test-retest stbility (dt tht show scores re stble cross repeted dministrtions). Split-hlf relibility ws clculted for ech of 28 ge groups in the ge norm smple. Split-hlf relibility is bsed on correltion of ech exminee s totl score on the odd-numbered items with his or her score on the even-numbered items. EVT 2 split-hlf relibilities re good to excellent, rnging from.88 to.97 for the ge groups. Alternte form stbility ws clculted bsed on the dt of 507 exminees who took both Form A nd Form B of the test. Alternte form relibilities re good to excellent, rnging from.83 to.91. Test-retest stbility ws clculted bsed on the dt from 348 exminees who were dministered the sme form of EVT 2 twice. Approximtely hlf of the smple took Form A, nd hlf of the smple took Form B. The test-retest correltions rnge from.94 to.97, indicting tht EVT 2 performnce is highly stble over time. Stndrd Error of Mesurement The stndrd error of mesurement (SEM) is sttistic tht estimtes the mount of error present in n ssessment nd the SEM is directly relted to the test s relibility coefficients nd the vribility (stndrd devition) of the test scores. The smller the SEM, the more confident you cn be in the precision of the test results. The SEMs for EVT 2 Form A nd Form B re shown in stndrd score units in Tble 6.2 for ge groups nd in Tble 6.3 for grde levels. The SEMs re bsed on the split-hlf relibilities. Becuse of its high relibility, the EVT 2 hs n verge SEM of only 3.8 or 3.9 stndrd score points for ge norms nd 3.5 stndrd score points for grde norms. 8
Tble 6.2 Split-Hlf nd Stndrd-Score SEMs, by Age Age N Split-Hlf SEM b Form A Form B Form A Form B Form A Form B 2:6 2:11 50 50.89.92 5.1 4.2 3:0 3:5 50 50.94.95 3.9 3.6 3:6 3:11 44 56.94.94 3.4 3.7 4:0 4:5 52 48.94.95 3.8 3.4 4:6 4:11 51 49.94.92 3.3 3.7 5:0 5:5 65 45.95.95 3.9 3.7 5:6 5:11 45 65.95.93 3.3 3.9 6:0 6:5 64 61.94.90 3.6 4.8 6:6 6:11 57 68.95.94 3.6 3.7 7 89 111.94.95 3.8 3.6 8 99 101.93.93 3.8 4.0 9 87 113.88.90 4.5 4.2 10 65 85.91.92 4.4 4.1 11 65 60.93.92 4.0 4.3 12 65 60.92.94 4.4 3.7 13 58 67.93.95 4.6 3.9 14 53 72.94.92 3.5 4.2 15 16 96 104.93.92 3.8 4.1 17 18 106 94.93.93 3.9 3.9 19 21 89 61.95.91 3.7 4.8 22 24 51 49.91.89 4.2 4.7 25 30 61 39.94.97 4.1 2.8 31 40 51 49.91.91 3.8 3.9 41 50 51 49.93.95 4.0 3.6 51 60 70 55.96.95 3.2 3.6 61 70 68 57.96.96 2.9 2.8 71 80 31 29.96.96 3.1 2.9 81+ 42 18.97.97 2.8 2.7 Men c.94.93 3.8 3.9 Note. N = 3,540. Adjusted to reflect the stndrd devition of scores in the entire ge group. b In stndrd score units, bsed on ech form s split-hlf relibility nd the ctul stndrd devition of stndrd scores for the entire ge group. c Weighted men, using Fisher s z trnsformtion for the relibilities. 9
Tble 6.3 Split-Hlf nd Stndrd-Score SEMs, by Grde nd Seson N Split-Hlf SEM b Grde Form A Form B Form A Form B Form A Form B Kindergrten, Fll 42 64.95.95 3.6 3.8 Kindergrten, Spring 70 57.94.91 3.2 4.0 1, Fll 50 67.96.93 3.3 4.0 1, Spring 54 62.94.96 3.8 3.1 2, Fll 42 58.94.92 3.6 4.1 2, Spring 49 50.92.92 4.2 4.0 3, Fll 50 41.93.93 3.7 3.9 3, Spring 48 61.93.91 3.9 4.5 4, Fll 29 55.88.92 5.6 4.6 4, Spring 44 49.88.90 4.4 4.1 5, Fll 36 32.86.91 4.9 3.9 5, Spring 28 44.95.93 3.9 4.4 6, Fll 28 27.90.89 4.7 4.9 6, Spring 35 35.90.90 4.4 4.4 7, Fll 28 31.94.97 4.7 3.5 7, Spring 34 23.91.96 5.1 3.1 8, Fll 26 37.96.93 3.1 4.1 8, Spring 34 44.93.97 4.9 3.3 9, Fll 29 29.92.93 4.2 4.1 9, Spring 27 31.94.90 3.6 4.5 10, Fll 22 25.90.90 3.9 3.9 10, Spring 26 27.95.92 3.8 4.8 11, Fll 27 23.96.96 3.0 3.1 11, Spring 25 30.90.89 4.9 5.1 12, Fll 26 33.94.93 3.8 4.3 12, Spring 30 29.95.93 3.3 3.8 Men c.93.93 4.0 4.0 Note. N = 2,003. Adjusted to reflect the stndrd devition of scores in the entire grde level. b In stndrd score units, bsed on ech form s split-hlf relibility nd the ctul stndrd devition of stndrd scores for the entire grde level. c Weighted verge, using Fisher s z trnsformtion for the relibilities. 10
Evidence Bsed on Vlidity Evidence of test vlidity refers to the degree to which specific dt, reserch, or theory supports tht test mesures the concepts it purports to mesure nd is pplicble to the intended popultion (AERA, APA, & NCME, in press). Different sources of evidence represent different spects of vlidity; however, these sources do not represent distinct types of vlidity. EVT 2 ddresses evidence bsed on test content, correltions with other tests, nd studies with specil popultions. Content Vlidity. Content vlidity ddresses the question of whether the items in test dequtely smple the domins tht the test purports to mesure. EVT 2 items were chosen on the bsis of frequency nd common usge to ensure n objective nd pproprite pprisl of stndrd Americn English vocbulry nd word retrievl. Words of high or modertely high frequency tht could be cquired through common life experiences were included; words tht require specilized knowledge were voided. All items were subjected to rigorous review process by content specilists nd expert bis reviewers. The sttisticl properties of items, s determined in three rounds of field testing, were used to refine the initil pool of items for finl selection. Correltions With Other Tests. Three correltion studies compre EVT 2 scores with scores obtined on instruments tht mesure vocbulry (Pebody Picture Vocbulry Test, Fourth Edition), lnguge bility (Clinicl Evlution of Lnguge Fundmentls, Fourth Edition), nd reding chievement (Group Reding Assessment nd Dignostic Evlution). These studies provide convergent evidence of the vlidity of interpreting EVT 2 scores s mesures of vocbulry nd word retrievl becuse it is expected tht ny instrument tht mesures vocbulry will correlte strongly with other tests tht mesure vocbulry, nd t somewht lower, but still substntil, level with other spects of lnguge nd reding skills. The fourth study ws correltion between scores on the EVT 2 nd EVT, with the purpose of ssessing the degree of continuity in the construct mesured by the two editions. Correltions of EVT 2 with Pebody Picture Vocbulry Test, Fourth Edition (PPVT 4). Correltions between EVT 2 nd PPVT 4 stndrd scores re presented for 3,540 exminees seprted into seven ge groups. The correltions re high nd uniform cross ge, rnging from.80 to.84. Correltions of EVT 2 with Clinicl Evlution of Lnguge Fundmentls, Fourth Edition (CELF -4). Correltions between EVT 2 nd CELF-4 stndrd scores re presented for 111 exminees seprted into two ge groups. The correltions re moderte to high, rnging from.68 to.80. Correltions of EVT 2 with Group Reding Assessment nd Dignostic Evlution (GRADE ). A smple of 487 exminees in kindergrten through Grde 11 ws dministered EVT 2 nd GRADE. Correltions between EVT 2 nd GRADE totl test scores re generlly in the.60s nd.70s. The correltions re consistent with expecttions tht the reltionship between vocbulry knowledge nd reding score tht is composite of severl spects of reding would be modertely strong. Correltions of EVT 2 with Expressive Vocbulry Test (EVT). The EVT 2 nd EVT were dministered in counterblnced sequence to 377 exminees in five ge groups. Correltions between EVT 2 nd EVT re consistently high, rnging from.78 to.82, indicting tht there is strong reltionship between the two editions. Correltions With Specil Popultions. EVT 2 is often used with individuls who re exceptionl in some wy. Studies were completed with 12 groups tht represent specific clinicl dignoses or specil eduction ctegories. Ech group s men EVT 2 stndrd scores were compred to the generl popultion verge. Tbles 6.17 6.20 present the differences between four clinicl smples (tht re commonly seen by speech-lnguge pthologists) nd the generl popultion, ll of which re sttisticlly significnt t the.001 level. 11
Tble 6.17 Lnguge Dely Smple: Averge EVT -2 Score nd Comprison to Nonclinicl Reference Group EVT 2 Stndrd Score Age N Men SD Difference From Nonclinicl Reference Group 3 7 63 88.1 12.3 12.0* Controlling for sex, rce/ethnicity, nd eduction level. *p <.001. Tble 6.19 Hering-Impirment Smples, Ages 4 Through 12: Averge EVT-2 Score nd Comprison to Nonclinicl Reference Group EVT 2 Stndrd Score Cochler Implnts N Men SD Difference From Nonclinicl Reference Group Yes 46 79.7 17.0 22.5* No 53 90.0 19.4 11.1* Controlling for sex, rce/ethnicity, nd eduction level. *p <.001. Tble 6.18 Lnguge Disorder Smples, by Age: Averge EVT-2 Score nd Comprison to Nonclinicl Reference Group EVT 2 Stndrd Score Age N Men SD Difference From Nonclinicl Reference Group 8 12 65 88.1 12.5 12.0* 50 92 45 75.0 23.7 25.0* Controlling for sex, rce/ethnicity, nd eduction level. * p <.001. Tble 6.20 Lerning-Disbility (Reding) Smple: Averge EVT-2 Score nd Comprison to Nonclinicl Reference Group EVT 2 Stndrd Score Age N Men SD Difference From Nonclinicl Reference Group 8 14 71 88.9 13.2 10.3* Controlling for sex, rce/ethnicity, nd eduction level. *p <.001. Summry EVT 2 is quick mesure of expressive vocbulry nd word retrievl skills for individuls ged 2 yers 6 months through 90 yers nd older. EVT 2 ws developed using rigorous scientific procedures in order to ensure tht it would produce highly relible nd vlid scores. EVT 2 cn be dministered s prt of lrger ssessment bttery or simply s brod indictor of orl vocbulry. 800.627.7271 PersonClinicl.com Copyright 2014 Person Eduction, Inc. or its ffilite(s). All rights reserved. CELF, Clinicl Evlution of Lnguge Fundmentls, EVT, GRADE, Q-globl, Alwys Lerning, Person, design for Psi, nd PsychCorp re trdemrks, in the U.S. nd/or other countries, of Person Eduction, Inc. or its ffilite(s). PPVT is trdemrk of Wscn Limited Prtnership. 8700 01/14