The World Health Organization (WHO) defined the QoL as a subjective perspective (The WHOQOL Group, 1993), while Laure (1999) suggested that both subjective and objective information is necessary to the QoL. In addition, item numbers is also of concern when choosing an instrument. The benefit of using fewer items such as the SQLS-R4 is less time consuming; the advantage of using more items such as the LQOLP is gaining more information. One more consideration of choosing an instrument is about the number of categories for an item response. More categories can more precisely measure the underlying construct, but additional effort may involve in scoring a more-category scale (Comrey and Montag, 1982). Although some researchers (Jenkins and Taber, 1977; McKelvie, 1978) mentioned that five-category scales such as the SQLSR4 are most reliable, some indicated that seven-category scales such as the LQOLP perform the best reliability (Preston and Colman, 2000).