Prevalence of obesity and smoking and their impact on estimated excess workdays lost per 100 Shell Oil Company employees, 1980–2009
| Mid-year of each time period* | ||||||
|---|---|---|---|---|---|---|
| 1982 | 1987 | 1992 | 1997 | 2002 | 2007 | |
| Prevalence (%) | ||||||
| Obesity | 14.2 | 19.9 | 27.8 | 35.4 | 38.9 | 42.4 |
| Smoking | 32.4 | 24.8 | 22.0 | 20.4 | 17.3 | 17.0 |
| Excess workdays lost per 100 employees | ||||||
| Obesity | 43 | 60 | 83 | 106 | 117 | 127 |
| Smoking | 65 | 50 | 44 | 41 | 35 | 34 |
| Ratio | 0.66 | 1.20 | 1.90 | 2.60 | 3.37 | 3.74 |
*Prevalence and excess workday values for the mid-year of each time period (ie, 1980–1984, 1985–1989, 1990–1994, 1995–1999, 2000–2004, 2005–2009) represent an average for that period.