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Table 3 Comparison of knowledge, theory of planned behavior constructs, and nutritional behavior before and after the intervention in each group

From: Assessing the impact of an educational intervention program based on the theory of planned behavior on the nutritional behaviors of adolescents and young adults with PCOS in Iran: a field trial study

Group Intervention group Result of repeated measures ANOVA Control group Result of repeated measures ANOVA
Variable Mean SD P-value Mean SD P-value
Before the intervention 5.1 1.3 P < 0.001 4.7 0.5 P = 0.18
Knowledge 7.1 1.2 5 0.8
After the intervention
Before the intervention 26.1 2.1 25.9 3.5
Attitude 30.9 2.9 P < 0.001 25.8 3.3 P = 0.59
After the intervention
Before the intervention 20.2 1.6 19.9 1.7
Subjective norms 22.7 1.6 P < 0.001 19.8 1.5 P = 0.43
After the intervention
Before the intervention 22.8 2.3 22.2 3.5
Perceived behavioral 26.6 2.2 P < 0.001 22.4 3.4 P = 0.87
control
After the intervention
Before the intervention 23.2 2.5 22.5 1.1
Behavioral intention 28.3 1.1 P < 0.001 22.4 2 P = 0.45
After the intervention
Before the intervention 20.6 1.6 20.9 1.5
Nutritional behavior 23.8 1.4 P < 0.001 21 1.7 P = 0.14
After the intervention