In a 14-week study, 82% of adult ESL treatment-group participants scored higher on the vocabulary posttest than pretest when scored as percent correct, versus 48% of control participants¶

Claim · All claims
Evidence · 1 study · causal r1 · q2
Currency · newest study 2017 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? When vocabulary scores were analyzed as percent of items correct over items completed, 82% of the treatment group improved from pretest to posttest compared with 48% of the control group. → Martinez 2017

Evidence¶

Martinez 2017¶

Liza E. Martinez. (2017). Adult Hispanic ESL Students and Graded Readers. The CATESOL Journal, 29(2). https://eric.ed.gov/?id=EJ1164286

q2 · i? · causal · r1

Quasi-experimental comparison of two intact upper-intermediate adult ESL classes, reported in the Findings section. The treatment class read graded readers via scaffolded silent reading; the control class did not. The article reports that "just 48% of the participants in the control group scored higher" while 82% of the treatment group did; no effect size or significance test is printed.

"Eighty-two percent of the participants in the treatment group scored higher on the posttest than the pretest. In contrast, just 48% of the participants in the control group scored higher on the posttest compared to the pretest."

Discussion¶

Related Claims¶

• Raw Vocabulary Size Test scores fell for the treatment group because most participants ran out of time on the posttest — related
• Adult ESL treatment participants reacted positively to graded readers and scaffolded silent reading, reporting perceived vocabulary and comprehension growth — related
• Nine of ten scored treatment-group participants performed at high-intermediate or advanced ESL reading comprehension levels on the TABE-CLAS-E posttest — related