This variable indicates that a person had a work-limiting disability at time t where t = a (earlier wave) or b (later wave). The information for wave a always comes from the disability topical module in wave 2. If an individual indicates a work-limiting disability in wave 2, disab_worklimit_a = 1. In all panels but 1984, this question is asked again in a later wave. The wave 2 topical module variable that informs disab_worklimit_a is TM8452 in the 1984 panel, TM8306 in the 1990, 1991, 1992, and 1993 panels, and ELMTVER in the 1996, 2001, 2004, and 2008 panels. Individuals asked this question are aged 16 to 67 except in 1984 where the age universe extends to age 72. The respective SIPP variables that inform disab_worklimit_b are TM8918 and TM8920 (in the topical module) for 1990, 1991, 1992, and 1993 panels and EDISABL (in the core) for 1996, 2001, 2004, and 2008 panels. The relevant variable can be found in wave 3 for 1990, 1991, and 1993; wave 5 for 1996, 2001, and 2004; and wave 6 for 1992 and 2008. The universe for this variable is all individuals who were at least age 15 and no older than age 70 by the end of the panel.