Table 3 Frequency of soy foods intake by participants
From: Soy consumption and risk of COPD and respiratory symptoms: a case-control study in Japan
Soy food | Cases (n = 278) | Controls (n = 340) | p value (chi-square test) |
|---|---|---|---|
Tofu* | 0.016 | ||
Never | 31 (11.2%) | 27 (8.0%) | |
1 to 3 times/month | 93 (33.6%) | 96 (28.6%) | |
1 to 6 times/week | 148 (53.4%) | 192 (57.1%) | |
At least once/day | 5 (1.8%) | 21 (6.3%) | |
Bean sprouts* | < 0.001 | ||
Never | 73 (26.3%) | 58 (17.3%) | |
1 to 3 times/month | 88 (31.7%) | 81 (24.1%) | |
1 to 6 times/week | 112 (40.3%) | 192 (57.1%) | |
At least once/day | 5 (1.8%) | 5 (1.5%) | |
Natto* | 0.001 | ||
Never | 107 (38.5%) | 84 (24.9%) | |
1 to 3 times/month | 39 (14.0%) | 41 (12.2%) | |
1 to 6 times/week | 101 (36.3%) | 155 (46.0%) | |
At least once/day | 31 (11.2%) | 57 (16.9%) | |
Soy milk* | 0.008 | ||
Never | 265 (95.3%) | 300 (89.6%) | |
At least once/week | 13 (4.7%) | 35 (10.4%) |