Table 2.
The proportion of correctly answering on 12 dietary knowledge in 2004–2015.
| 2004 | 2006 | 2009 | 2011 | 2015 | Cochran-Armitage χ2 | ||
|---|---|---|---|---|---|---|---|
| Q1 | Choosing a diet with a lot of fresh fruits and vegetables is good for one’s health. | 124 (5.7) | 1799 (75.0) | 2031 (74.7) | 2807 (75.0) | 3393 (74.3) | 1515.41 a *** |
| Q2 c | Eating a lot of sugar is good for one’s health. | 1536 (70.4) | 1631 (68.0) | 2007 (73.8) | 2952 (78.8) | 3222 (70.6) | 4.65 a * |
| Q3 | Eating a variety of foods is good for one’s health. | 74 (3.4) | 1794 (74.8) | 2005 (73.8) | 2861 (76.4) | 3303 (72.4) | 1487.21 a *** |
| Q4 c | Choosing a diet high in fat is good for one’s health. | 1510 (69.2) | 1577 (65.7) | 2013 (74.1) | 2888 (77.1) | 3158 (69.2) | 4.46 a * |
| Q5 | Choosing a diet with a lot of staple foods (rice and rice products, wheat and wheat products) is not good for one’s health. | 17 (0.8) | 879 (36.6) | 1009 (37.1) | 1554 (41.5) | 1790 (39.2) | 567.81 a *** |
| Q6 c | Consuming a lot of animal products daily (fish, poultry, eggs and lean meat) is good for one’s health. | 1160 (53.2) | 1099 (45.8) | 1398 (51.4) | 2141 (57.2) | 2717 (59.5) | 92.75 a *** |
| Q7 | Reducing the amount of fatty meat and animal fat in the diet is good for one’s health. | 62 (2.8) | 1525 (63.6) | 1943 (71.5) | 2786 (74.4) | 3054 (66.9) | 1403.74 a *** |
| Q8 | Consuming milk and dairy products is good for one’s health. | 149 (6.8) | 1959 (81.7) | 2258 (83.1) | 3195 (85.3) | 3593 (78.7) | 1801.89 a *** |
| Q9 | Consuming beans and bean products is good for one’s health. | 169 (7.7) | 2046 (85.3) | 2347 (86.4) | 3235 (86.4) | 3672 (80.5) | 1827.50 a *** |
| Q10 | Physical activities are good for one’s health. | 136 (6.2) | 1972 (82.2) | 2198 (80.9) | 3120 (83.3) | 3440 (75.4) | 1475.46 a *** |
| Q11 c | Sweaty sports or other intense physical activities are not good for one’s health. | 698 (32.0) | 619 (25.8) | 689 (25.3) | 919 (24.5) | 1156 (25.3) | 20.05 b *** |
| Q12 c | The heavier one’s body is, the healthier he or she is. | 1706 (78.2) | 1960 (81.7) | 2227 (81.9) | 3222 (86.6) | 3343 (73.2) | 43.93 b *** |
Q, question. a upward trend; b downward trend; c negative item. * p <0.05; ** p <0.01; *** p <0.001.