The difference is statistically significant; the difference in the scores of health knowledge and health literacy between boys and girls is not statistically significant. <br>3. Middle school students of different grades have different scores in the three dimensions of total health literacy scores, health behaviors, health knowledge and health skills, and the differences are statistically significant. With the increase of grades, the health literacy scores of middle school students showed a decrease. <br>4. The health literacy of middle school students in different schools and their scores in three dimensions are statistically different (P
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