Table 1.
Descriptive characteristics of non-cardia gastric cancer cases and controls from Linxian General Population Nutrition Intervention Trial, from the baseline (1985) and 1999/2000 collections.
| Characteristic | Serum: Baseline/1985 collection | Plasma: 1999/2000 collection | ||||
|---|---|---|---|---|---|---|
| GNCA cases (n=330) |
Controls (n=330) |
P value | GNCA cases (n=118) |
Sub-cohort (n=912) |
P value | |
| Male, N (%) | 222 (67) | 222 (67) | 1.001 | 65 (55) | 448 (49) | 0.221 |
| Age at blood draw, yrs, mean (SD) | 56 (8) | 52 (9) | <0.0012 | 65 (7) | 64 (8) | 0.272 |
| Ever smokers, N (%) | 158 (48) | 165 (50) | 0.561 | 41 (34) | 291 (32) | 0.561 |
| Drank alcohol in last 12 months, N (%) | 78 (24) | 103 (31) | 0.031 | 25 (21) | 242 (27) | 0.201 |
| Body mass index, mean kg/m2 (SD) | 21.52 (2.23) | 21.88 (2.27) | 0.042 | 21.30 (2.04) | 21.93 (2.38) | 0.0072 |
| Median time to diagnosis/death/end of follow-up, yrs, (IQR) |
6.99 (3.89-11.25) |
16.05 (13.54-16.09) |
<0.0012 | 3.60 (1.72, 5.18) |
6.74 (6.67, 7.10) |
<0.0012 |
1
P values were calculated by Pearson χ2 test
2
P values were calculated by Student t test