Most employees in this industry work full time, and many work over 40 hours a week. In 2002, about 1 in 5 construction workers worked 45 hours or more a week. Construction workers may sometimes work evenings, weekends, and holidays to finish a job or take care of an emergency. Workers in this industry need physical stamina because the work frequently requires prolonged standing, bending, stooping, and working in cramped quarters. They also may be required to lift and carry heavy objects. Exposure to weather is common because much of the work is done outside or in partially enclosed structures. Construction workers often work with potentially dangerous tools and equipment amidst a clutter of building materials; some work on temporary scaffolding or at great heights and in bad weather. Consequently, they are more prone to injuries than are workers in other jobs. In 2002, cases of work-related injury and illness were 7.1 per 100 full-time construction workers, which is significantly higher than the 5.3 rate for the entire private sector. Workers who do roofing, siding, and sheet metal work experienced the highest injury rates. In response, employers increasingly emphasize safe working conditions and work habits that reduce the risk of injuries. To avoid injury, employees wear safety clothing, such as gloves and hardhats, and sometimes devices to protect their eyes, mouth, or hearing.