Table 1 The characteristics and fluorescence intensity of volunteers
Age range (years) | 21-30 | 31-40 | 41-50 | 51-60 | 61-70 | 71-80 |
|---|---|---|---|---|---|---|
Total number | 6 | 12 | 9 | 15 | 12 | 6 |
Number of male | 3 | 9 | 6 | 9 | 6 | 3 |
Fluorescence intensity (mean ± SD) | 14.8 ± 0.69 | 11.8 ± 0.92 | 9 ± 1.07 | 7.87 ± 1.64 | 6.18 ± 0.76 | 6.15 ± 0.04 |
Occupation | Â | Â | Â | Â | Â | Â |
 Student | 3 | 0 | 0 | 0 | 0 | 0 |
 Professional | 0 | 4 | 4 | 2 | 1 | 0 |
 Administrative | 0 | 2 | 1 | 3 | 1 | 0 |
 Sales | 1 | 3 | 1 | 0 | 0 | 0 |
 Blue-collar | 1 | 2 | 1 | 0 | 0 | 0 |
 Freelance | 1 | 1 | 2 | 0 | 0 | 0 |
 Retired | 0 | 0 | 0 | 10 | 10 | 6 |
Family history | Â | Â | Â | Â | Â | Â |
 Stomach cancer | 0 | 0 | 0 | 0 | 0 | 0 |
 Other cancer | 0 | 0 | 1 | 0 | 0 | 0 |
History of peptic ulcer | 0 | 0 | 0 | 0 | 0 | 0 |
 Smoking status & history | 0 | 2 | 2 | 1 | 1 | 0 |
 Seldom | 0 | 1 | 0 | 0 | 1 | 0 |
 <10 cigarettes per day | 0 | 1 | 2 | 1 | 0 | 0 |
 10-20 cigarettes per day | 0 | 0 | 0 | 0 | 0 | 0 |
 >20 cigarettes per day | 0 | 0 | 0 | 0 | 0 | 0 |
 Less than 5 years | 0 | 1 | 0 | 0 | 0 | 0 |
 5-10 years | 0 | 1 | 1 | 0 | 0 | 0 |
 More than 10 years | 0 | 0 | 1 | 1 | 1 | 0 |
Alcohol drinking habits | 0 | 2 | 1 | 2 | 1 | 0 |
 <250 ml per day | 0 | 2 | 1 | 2 | 0 | 0 |
 >250 ml per day | 0 | 0 | 0 | 0 | 0 | 0 |
 Less than 5 years | 0 | 1 | 0 | 0 | 0 | 0 |
 More than 5 years | 0 | 1 | 1 | 2 | 1 | 0 |
Coffee habits | 2 | 1 | 0 | 0 | 0 | 0 |
Tea drinking habits | 1 | 2 | 2 | 1 | 0 | 1 |