“…In the literature on second language DIF analysis, the commonly investigated group variables include native language (Abbott, 2007;Elder, McNamara, & Congdon, 2003;Jang & Roussos, 2009;Kim & Jang, 2009;Lee, Breland, & Muraki, 2005;Ryan & Bachman, 1992;Sasaki, 1991), gender (e.g., Breland, Lee, Najarian, & Muraki, 2004;Roznowski & Reith, 1999;Ryan & Bachman, 1992;Singh, 2005;Takala & Kaftandjieva, 2000) and ethnicity (e.g., Roznowski & Reith, 1999;Snetzler & Qualls, 2000). ( (For example, Chinese students performed better on grammar items in several studies, which was explained by their intensive training in English syntax, as in Sasaki, 1991.…”