Table 3.
Relationship between dietary habits with Chinese herbs and NPC
| Intake frequency * and duration | Case/Ctrl | OR (95%CI)# | P trend |
|---|---|---|---|
| Herbal tea habit | |||
| Less than monthly (ref) | 439/347 | 1.0 | |
| Monthly | 425/717 | 0.46(0.38-0.56) | < 0.0001 |
| Weekly or more | 369/347 | 0.84(0.68-1.03) | |
| Herbal tea (years) | |||
| Less than monthly (ref) | 439/347 | 1.0 | |
| 1-9 | 237/237 | 0.81(0.64-1.03) | < 0.0001 |
| 10-19 | 88/320 | 0.22(0.16-0.29) | |
| ≥20 | 146/457 | 0.25(0.19-0.31) | |
| Slow-cooked soup habit | |||
| Less than monthly (ref) | 313/214 | 1.0 | |
| Monthly | 39/42 | 0.49(0.27-0.87) | < 0.001 |
| Weekly or more | 996/1184 | 0.58(0.47-0.72) | |
| Slow-cooked soup (years) | |||
| Less than monthly (ref) | 313/214 | 1.0 | |
| 1-9 | 146/142 | 0.67(0.50-0.90) | < 0.0001 |
| 10-19 | 310/380 | 0.53(0.42-0.67) | |
| ≥20 | 250/659 | 0.22(0.18-0.28) |
* Intake frequency was categorised as follows: less than monthly, < once per month; monthly, once per month to once per week; weekly or more, ≥ once per week; daily, ≥ once per day.
# OR, odds ratio calculated among matched case and control groups, adjusting for sex, age, education, dialect and household type.