Range of estimated excess workdays lost due to obesity and smoking based on alternative assumptions for differential productivity loss per 100 Shell Oil Company employees, 1980–2009
| Mid-year of each time period* | ||||||
|---|---|---|---|---|---|---|
| 1982 | 1987 | 1992 | 1997 | 2002 | 2007 | |
| Excess workdays lost: obesity (2 days), smoking (2 days) | ||||||
| Obesity | 28 | 40 | 56 | 71 | 78 | 85 |
| Smoking | 65 | 50 | 44 | 41 | 35 | 34 |
| Ratio | 0.44 | 0.80 | 1.26 | 1.74 | 2.25 | 2.50 |
| Excess workdays lost: obesity (2 days), smoking (3 days) | ||||||
| Obesity | 28 | 40 | 56 | 71 | 78 | 85 |
| Smoking | 97 | 74 | 66 | 61 | 52 | 51 |
| Ratio | 0.29 | 0.53 | 0.84 | 1.16 | 1.50 | 1.66 |
*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.