Huang and colleagues grouped careers into four categories based on how much control employees had over their job and how hard they worked or the psychological demands of the job. The categories included passive jobs, low-stress jobs, high-stress jobs and active jobs. Job factors included time pressure, mental demands and coordination burdens. Physical labor and total number of hours worked were not included. People that have passive jobs included janitors, miners and various other manual laborers, who got little demand and small control. Low-stress jobs included researchers and architects, who got low demand and high control, according to the study.On univariate analysis, illness was significantly associated with eating natural tomatoes and with feeding on tortillas . After adjustment for the consumption of tortillas, disease remained significantly connected with eating natural tomatoes . Illness was not significantly associated with consuming salsa , guacamole , or any other meal. The consumption of hot peppers was not assessed because only 26 percent of case subjects reported eating other peppers in hypothesis-generating interviews. Study 2 included 141 case subjects and 281 matched control topics. After adjustment for sex, Hispanic ethnic background, and age, illness was significantly connected with consuming at Mexican-design restaurants , corn tortillas , and freshly prepared salsa .